CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>List of bilaterian orders - Wikipedia</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy", "wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"ac050fc9-8913-4b9b-acd0-e5bb8e5146ab","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"List_of_bilaterian_orders","wgTitle":"List of bilaterian orders","wgCurRevisionId":1256991620,"wgRevisionId":1256991620,"wgArticleId":47805031,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["Articles with short description","Short description is different from Wikidata","Bilaterian orders","Taxonomic lists (orders)"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"List_of_bilaterian_orders","wgRelevantArticleId":47805031,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgRedirectedFrom":"List_of_bilaterial_animal_orders", "wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{"status":{"levels":1}}},"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":20000,"wgInternalRedirectTargetUrl":"/wiki/List_of_bilaterian_orders","wgRelatedArticlesCompat":[],"wgCentralAuthMobileDomain":false,"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q20969877","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true, "wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.cite.styles":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["mediawiki.action.view.redirect","ext.cite.ux-enhancements","mediawiki.page.media","site","mediawiki.page.ready","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin","mmv.bootstrap","ext.popups", "ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.cite.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/3/3b/AnimalsRelativeNumbers.png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="873"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/AnimalsRelativeNumbers.png/800px-AnimalsRelativeNumbers.png"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="582"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/AnimalsRelativeNumbers.png/640px-AnimalsRelativeNumbers.png"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="466"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="List of bilaterian orders - Wikipedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//en.m.wikipedia.org/wiki/List_of_bilaterian_orders"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=List_of_bilaterian_orders&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/List_of_bilaterian_orders"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="alternate" type="application/atom+xml" title="Wikipedia Atom feed" href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-List_of_bilaterian_orders rootpage-List_of_bilaterian_orders skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Jump to content</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Main menu" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Main menu</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Main menu</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">hide</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navigation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Main_Page" title="Visit the main page [z]" accesskey="z"><span>Main page</span></a></li><li id="n-contents" class="mw-list-item"><a href="/wiki/Wikipedia:Contents" title="Guides to browsing Wikipedia"><span>Contents</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Portal:Current_events" title="Articles related to current events"><span>Current events</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Visit a randomly selected article [x]" accesskey="x"><span>Random article</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About" title="Learn about Wikipedia and how it works"><span>About Wikipedia</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us" title="How to contact Wikipedia"><span>Contact us</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Contribute </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="Guidance on how to use and edit Wikipedia"><span>Help</span></a></li><li id="n-introduction" class="mw-list-item"><a href="/wiki/Help:Introduction" title="Learn how to edit Wikipedia"><span>Learn to edit</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Community_portal" title="The hub for editors"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes to Wikipedia [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_upload_wizard" title="Add images or other media for use on Wikipedia"><span>Upload file</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Main_Page" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="The Free Encyclopedia" src="/static/images/mobile/copyright/wikipedia-tagline-en.svg" width="117" height="13" style="width: 7.3125em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search Wikipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Appearance" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Appearance</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=List+of+bilaterian+orders" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=List+of+bilaterian+orders" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Log in and more options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=List+of+bilaterian+orders" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=List+of+bilaterian+orders" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contents</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-List" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#List"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>List</span> </div> </a> <button aria-controls="toc-List-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle List subsection</span> </button> <ul id="toc-List-sublist" class="vector-toc-list"> <li id="toc-Phylum_Annelida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Annelida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Phylum Annelida</span> </div> </a> <ul id="toc-Phylum_Annelida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Arthropoda" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Arthropoda"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Phylum Arthropoda</span> </div> </a> <ul id="toc-Phylum_Arthropoda-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Brachiopoda" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Brachiopoda"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Phylum Brachiopoda</span> </div> </a> <ul id="toc-Phylum_Brachiopoda-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Bryozoa" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Bryozoa"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Phylum Bryozoa</span> </div> </a> <ul id="toc-Phylum_Bryozoa-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Chaetognatha" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Chaetognatha"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.5</span> <span>Phylum Chaetognatha</span> </div> </a> <ul id="toc-Phylum_Chaetognatha-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Chordata" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Chordata"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6</span> <span>Phylum Chordata</span> </div> </a> <ul id="toc-Phylum_Chordata-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Cycliophora" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Cycliophora"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.7</span> <span>Phylum Cycliophora</span> </div> </a> <ul id="toc-Phylum_Cycliophora-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Dicyemida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Dicyemida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.8</span> <span>Phylum Dicyemida</span> </div> </a> <ul id="toc-Phylum_Dicyemida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Echinodermata" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Echinodermata"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.9</span> <span>Phylum Echinodermata</span> </div> </a> <ul id="toc-Phylum_Echinodermata-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Entoprocta" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Entoprocta"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.10</span> <span>Phylum Entoprocta</span> </div> </a> <ul id="toc-Phylum_Entoprocta-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Gastrotricha" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Gastrotricha"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.11</span> <span>Phylum Gastrotricha</span> </div> </a> <ul id="toc-Phylum_Gastrotricha-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Gnathostomulida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Gnathostomulida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.12</span> <span>Phylum Gnathostomulida</span> </div> </a> <ul id="toc-Phylum_Gnathostomulida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Hemichordata" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Hemichordata"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.13</span> <span>Phylum Hemichordata</span> </div> </a> <ul id="toc-Phylum_Hemichordata-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Kinorhyncha" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Kinorhyncha"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.14</span> <span>Phylum Kinorhyncha</span> </div> </a> <ul id="toc-Phylum_Kinorhyncha-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Loricifera" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Loricifera"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.15</span> <span>Phylum Loricifera</span> </div> </a> <ul id="toc-Phylum_Loricifera-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Micrognathozoa" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Micrognathozoa"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.16</span> <span>Phylum Micrognathozoa</span> </div> </a> <ul id="toc-Phylum_Micrognathozoa-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Mollusca" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Mollusca"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.17</span> <span>Phylum Mollusca</span> </div> </a> <ul id="toc-Phylum_Mollusca-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Nematoda" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Nematoda"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.18</span> <span>Phylum Nematoda</span> </div> </a> <ul id="toc-Phylum_Nematoda-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Nematomorpha" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Nematomorpha"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.19</span> <span>Phylum Nematomorpha</span> </div> </a> <ul id="toc-Phylum_Nematomorpha-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Nemertea" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Nemertea"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.20</span> <span>Phylum Nemertea</span> </div> </a> <ul id="toc-Phylum_Nemertea-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Onychophora" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Onychophora"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.21</span> <span>Phylum Onychophora</span> </div> </a> <ul id="toc-Phylum_Onychophora-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Orthonectida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Orthonectida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.22</span> <span>Phylum Orthonectida</span> </div> </a> <ul id="toc-Phylum_Orthonectida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Phoronida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Phoronida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.23</span> <span>Phylum Phoronida</span> </div> </a> <ul id="toc-Phylum_Phoronida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Platyhelminthes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Platyhelminthes"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.24</span> <span>Phylum Platyhelminthes</span> </div> </a> <ul id="toc-Phylum_Platyhelminthes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Priapulida" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Priapulida"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.25</span> <span>Phylum Priapulida</span> </div> </a> <ul id="toc-Phylum_Priapulida-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Rotifera" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Rotifera"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.26</span> <span>Phylum Rotifera</span> </div> </a> <ul id="toc-Phylum_Rotifera-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Tardigrada" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Tardigrada"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.27</span> <span>Phylum Tardigrada</span> </div> </a> <ul id="toc-Phylum_Tardigrada-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Phylum_Xenacoelomorpha" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Phylum_Xenacoelomorpha"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.28</span> <span>Phylum Xenacoelomorpha</span> </div> </a> <ul id="toc-Phylum_Xenacoelomorpha-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Notes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Notes</span> </div> </a> <ul id="toc-Notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">List of bilaterian orders</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 2 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-2" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">2 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Anexo:Animales_bilaterales" title="Anexo:Animales bilaterales – Spanish" lang="es" hreflang="es" data-title="Anexo:Animales bilaterales" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Danh_s%C3%A1ch_b%E1%BB%99_thu%E1%BB%99c_nh%C3%A1nh_%C4%91%E1%BB%99ng_v%E1%BA%ADt_%C4%91%E1%BB%91i_x%E1%BB%A9ng_hai_b%C3%AAn" title="Danh sách bộ thuộc nhánh động vật đối xứng hai bên – Vietnamese" lang="vi" hreflang="vi" data-title="Danh sách bộ thuộc nhánh động vật đối xứng hai bên" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q20969877#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/List_of_bilaterian_orders" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:List_of_bilaterian_orders" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/List_of_bilaterian_orders"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/List_of_bilaterian_orders"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/List_of_bilaterian_orders" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/List_of_bilaterian_orders" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&oldid=1256991620" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=List_of_bilaterian_orders&id=1256991620&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FList_of_bilaterian_orders"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FList_of_bilaterian_orders"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=List_of_bilaterian_orders&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=List_of_bilaterian_orders&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q20969877" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=List_of_bilaterial_animal_orders&redirect=no" class="mw-redirect" title="List of bilaterial animal orders">List of bilaterial animal orders</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p class="mw-empty-elt"> </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:AnimalsRelativeNumbers.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/AnimalsRelativeNumbers.png/250px-AnimalsRelativeNumbers.png" decoding="async" width="250" height="182" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/AnimalsRelativeNumbers.png/375px-AnimalsRelativeNumbers.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3b/AnimalsRelativeNumbers.png/500px-AnimalsRelativeNumbers.png 2x" data-file-width="1031" data-file-height="750" /></a><figcaption>The relative number of species contributed to the total by each phylum of animals. Arthropoda is the phylum with the most individual organisms.</figcaption></figure> <p><b>Bilateria</b> is an extremely diverse group of animals containing a vast majority of its species, largely due to the enormous amount of <a href="/wiki/Arthropods" class="mw-redirect" title="Arthropods">arthropods</a>. This article is a list of orders contained within <a href="/wiki/Bilateria" title="Bilateria">Bilateria</a> separated by phylum. Groups that are not contained within an order are listed separately. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="List">List</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=1" title="Edit section: List"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Phylum_Annelida">Phylum <a href="/wiki/Annelida" class="mw-redirect" title="Annelida">Annelida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=2" title="Edit section: Phylum Annelida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Sv%C3%B8mmende_blodigle.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Sv%C3%B8mmende_blodigle.JPG/250px-Sv%C3%B8mmende_blodigle.JPG" decoding="async" width="250" height="228" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Sv%C3%B8mmende_blodigle.JPG/375px-Sv%C3%B8mmende_blodigle.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Sv%C3%B8mmende_blodigle.JPG/500px-Sv%C3%B8mmende_blodigle.JPG 2x" data-file-width="847" data-file-height="773" /></a><figcaption><i><a href="/wiki/Hirudo_medicinalis" title="Hirudo medicinalis">Hirudo medicinalis</a></i>. Order <a href="/wiki/Arhynchobdellida" title="Arhynchobdellida">Arhynchobdellida</a></figcaption></figure> <p>Annelid taxonomy is currently under constant revisions due to the discovery that the class <a href="/wiki/Polychaeta" class="mw-redirect" title="Polychaeta">Polychaeta</a> is paraphyletic. As such, a comprehensive list of orders is likely to change depending on what is accepted as valid. </p> <ul><li><b><a href="/wiki/Amphinomida" title="Amphinomida">Amphinomida</a></b></li></ul> <p>Class <a href="/wiki/Sipuncula" title="Sipuncula">Sipuncula</a> </p> <ul><li><b><a href="/wiki/Aspidosiphonidae" title="Aspidosiphonidae">Aspidosiphonida</a></b></li> <li><b><a href="/wiki/Golfingiida" title="Golfingiida">Golfingiida</a></b></li> <li><b><a href="/wiki/Phascolosomatidae" title="Phascolosomatidae">Phascolosomatida</a></b></li></ul> <p>Clade <a href="/wiki/Pleistoannelida" title="Pleistoannelida">Pleistoannelida</a> </p> <ul><li>Clade <a href="/wiki/Errantia" title="Errantia">Errantia</a> <ul><li><b><a href="/wiki/Eunicida" title="Eunicida">Eunicida</a></b></li> <li><b><a href="/wiki/Phyllodocida" title="Phyllodocida">Phyllodocida</a></b></li> <li><b><a href="/wiki/Protodrilida" title="Protodrilida">Protodrilida</a></b></li></ul></li> <li><b><a href="/wiki/Myzostomida" title="Myzostomida">Myzostomida</a></b></li> <li>Clade <a href="/wiki/Sedentaria" title="Sedentaria">Sedentaria</a> <ul><li><b><a href="/wiki/Capitellida" title="Capitellida">Capitellida</a></b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup> <ul><li>Family <a href="/wiki/Capitellidae" title="Capitellidae">Capitellidae</a></li> <li>Subclass <a href="/wiki/Echiura" title="Echiura">Echiura</a> <ul><li><b><a href="/wiki/Bonelliida" title="Bonelliida">Bonelliida</a></b></li> <li><b><a href="/wiki/Echiurida" title="Echiurida">Echiurida</a></b></li></ul></li></ul></li> <li><b><a href="/wiki/Opheliida" title="Opheliida">Opheliida</a></b></li> <li><b><a href="/wiki/Orbiniida" title="Orbiniida">Orbiniida</a></b></li> <li><b><a href="/wiki/Sabellida" title="Sabellida">Sabellida</a></b></li> <li><b><a href="/wiki/Spionida" title="Spionida">Spionida</a></b></li> <li><b><a href="/wiki/Terebellida" title="Terebellida">Terebellida</a></b></li> <li>Class <a href="/wiki/Clitellata" title="Clitellata">Clitellata</a> <ul><li><b><a href="/wiki/Branchiobdellida" title="Branchiobdellida">Branchiobdellida</a></b></li> <li><b><a href="/wiki/Haplotaxida" title="Haplotaxida">Haplotaxida</a></b></li> <li><b><a href="/wiki/Lumbriculida" class="mw-redirect" title="Lumbriculida">Lumbriculida</a></b></li> <li><b><a href="/wiki/Moniligastrida" class="mw-redirect" title="Moniligastrida">Moniligastrida</a></b></li> <li>Subclass <a href="/wiki/Hirudinea" class="mw-redirect" title="Hirudinea">Hirudinea</a> <ul><li><b><a href="/wiki/Rhynchobdellida" title="Rhynchobdellida">Rhynchobdellida</a></b></li> <li><b><a href="/wiki/Arhynchobdellida" title="Arhynchobdellida">Arhynchobdellida</a></b></li></ul></li></ul></li></ul></li></ul> <p>Unplaced groups </p> <ul><li>Genus <i>Apistobranchus</i></li> <li>Suborder Chaetopteriformia</li> <li>Suborder Cirratuliformia</li> <li>Genus <i>Lobatocerebrum</i></li> <li>Clade <a href="/wiki/Maldanomorpha" title="Maldanomorpha">Maldanomorpha</a></li> <li>Clade Paleoannelida</li> <li>Family <a href="/wiki/Polygordiidae" title="Polygordiidae">Polygordiidae</a></li> <li>Family <a href="/wiki/Siboglinidae" title="Siboglinidae">Siboglinidae</a><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>b<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Arthropoda">Phylum <a href="/wiki/Arthropoda" class="mw-redirect" title="Arthropoda">Arthropoda</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=3" title="Edit section: Phylum Arthropoda"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Housefly_on_a_leaf_crop.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Housefly_on_a_leaf_crop.jpg/250px-Housefly_on_a_leaf_crop.jpg" decoding="async" width="250" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Housefly_on_a_leaf_crop.jpg/375px-Housefly_on_a_leaf_crop.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Housefly_on_a_leaf_crop.jpg/500px-Housefly_on_a_leaf_crop.jpg 2x" data-file-width="1346" data-file-height="898" /></a><figcaption>The <a href="/wiki/House_fly" class="mw-redirect" title="House fly">house fly</a>. Order <a href="/wiki/Diptera" class="mw-redirect" title="Diptera">Diptera</a></figcaption></figure> <p>See <a href="/wiki/List_of_arthropod_orders" title="List of arthropod orders">List of arthropod orders</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Brachiopoda">Phylum <a href="/wiki/Brachiopoda" class="mw-redirect" title="Brachiopoda">Brachiopoda</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=4" title="Edit section: Phylum Brachiopoda"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Terebratalia_transversa_141510036.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Terebratalia_transversa_141510036.jpg/250px-Terebratalia_transversa_141510036.jpg" decoding="async" width="250" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Terebratalia_transversa_141510036.jpg/375px-Terebratalia_transversa_141510036.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Terebratalia_transversa_141510036.jpg/500px-Terebratalia_transversa_141510036.jpg 2x" data-file-width="2048" data-file-height="1365" /></a><figcaption><i><a href="/wiki/Terebratalia_transversa" title="Terebratalia transversa">Terebratalia transversa</a></i>. Order <a href="/wiki/Terebratulida" title="Terebratulida">Terebratulida</a></figcaption></figure> <p>Class <a href="/wiki/Craniata_(brachiopod)" title="Craniata (brachiopod)">Craniata</a> </p> <ul><li><b><a href="/wiki/Craniidae" title="Craniidae">Craniida</a></b></li> <li><b><a href="/wiki/Craniopsida" class="mw-redirect" title="Craniopsida">Craniopsida</a></b> †</li> <li><b><a href="/wiki/Trimerellida" title="Trimerellida">Trimerellida</a></b> †</li></ul> <p>Subphylum <a href="/wiki/Linguliformea" title="Linguliformea">Linguliformea</a> </p> <ul><li>Class <a href="/wiki/Lingulata" title="Lingulata">Lingulata</a> <ul><li><b><a href="/wiki/Acrotretida" title="Acrotretida">Acrotretida</a></b> †</li> <li><b><a href="/wiki/Lingulida" title="Lingulida">Lingulida</a></b></li> <li><b><a href="/wiki/Siphonotretida" title="Siphonotretida">Siphonotretida</a></b> †</li></ul></li> <li>Class <a href="/wiki/Paterinata" title="Paterinata">Paterinata</a> <ul><li><b><a href="/wiki/Paterinida" class="mw-redirect" title="Paterinida">Paterinida</a></b> †</li></ul></li></ul> <p>Subphylum <a href="/wiki/Rhynchonelliformea" title="Rhynchonelliformea">Rhynchonelliformea</a> </p> <ul><li>Class <a href="/wiki/Chileata" title="Chileata">Chileata</a> <ul><li><b><a href="/wiki/Chileida" class="mw-redirect" title="Chileida">Chileida</a></b> †</li> <li><b><a href="/wiki/Dictyonellida" title="Dictyonellida">Dictyonellida</a></b> †</li></ul></li> <li>Class <a href="/wiki/Kutorginata" title="Kutorginata">Kutorginata</a> <ul><li><b><a href="/wiki/Kutorginida" class="mw-redirect" title="Kutorginida">Kutorginida</a></b> †</li></ul></li> <li>Class <a href="/wiki/Obolellata" title="Obolellata">Obolellata</a> <ul><li><b><a href="/wiki/Naukatida" class="mw-redirect" title="Naukatida">Naukatida</a></b> †</li> <li><b><a href="/wiki/Obolellida" class="mw-redirect" title="Obolellida">Obolellida</a></b> †</li></ul></li> <li>Class <a href="/wiki/Rhynchonellata" title="Rhynchonellata">Rhynchonellata</a> <ul><li><b><a href="/wiki/Athyridida" title="Athyridida">Athyridida</a></b> †</li> <li><b><a href="/wiki/Atrypida" title="Atrypida">Atrypida</a></b> †</li> <li><b><a href="/wiki/Orthida" title="Orthida">Orthida</a></b> †</li> <li><b><a href="/wiki/Protorthida" title="Protorthida">Protorthida</a></b> †</li> <li><b><a href="/wiki/Pentamerida" title="Pentamerida">Pentamerida</a></b> †</li> <li><b><a href="/wiki/Rhynchonellida" title="Rhynchonellida">Rhynchonellida</a></b></li> <li><b><a href="/wiki/Spiriferida" title="Spiriferida">Spiriferida</a></b> †</li> <li><b><a href="/wiki/Terebratulida" title="Terebratulida">Terebratulida</a></b></li> <li><b><a href="/wiki/Thecideida" title="Thecideida">Thecideida</a></b></li></ul></li> <li>Class <a href="/wiki/Strophomenata" title="Strophomenata">Strophomenata</a> <ul><li><b><a href="/wiki/Billingsellida" title="Billingsellida">Billingsellida</a></b> †</li> <li><b><a href="/wiki/Orthotetida" title="Orthotetida">Orthotetida</a></b> †</li> <li><b><a href="/wiki/Productida" title="Productida">Productida</a></b> †</li> <li><b><a href="/wiki/Strophomenida" title="Strophomenida">Strophomenida</a></b> †</li></ul></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Bryozoa">Phylum <a href="/wiki/Bryozoa" title="Bryozoa">Bryozoa</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=5" title="Edit section: Phylum Bryozoa"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Membranipora_membranacea.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Membranipora_membranacea.jpg/250px-Membranipora_membranacea.jpg" decoding="async" width="250" height="168" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Membranipora_membranacea.jpg/375px-Membranipora_membranacea.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/8/8e/Membranipora_membranacea.jpg 2x" data-file-width="467" data-file-height="314" /></a><figcaption>A colony of <i>Membranipora membranacea</i>. Order <a href="/wiki/Cheilostomatida" title="Cheilostomatida">Cheilostomatida</a></figcaption></figure> <p>Class <a href="/wiki/Gymnolaemata" title="Gymnolaemata">Gymnolaemata</a> </p> <ul><li><b><a href="/wiki/Cheilostomata" class="mw-redirect" title="Cheilostomata">Cheilostomata</a></b></li> <li><b><a href="/wiki/Ctenostomatida" title="Ctenostomatida">Ctenostomatida</a></b></li></ul> <p>Class <a href="/wiki/Phylactolaemata" title="Phylactolaemata">Phylactolaemata</a> </p> <ul><li><b><a href="/wiki/Plumatellida" class="mw-redirect" title="Plumatellida">Plumatellida</a></b></li></ul> <p>Class <a href="/wiki/Stenolaemata" title="Stenolaemata">Stenolaemata</a> </p> <ul><li><b><a href="/wiki/Cyclostomatida" title="Cyclostomatida">Cyclostomatida</a></b></li> <li><b><a href="/wiki/Cryptostomata" title="Cryptostomata">Cryptostomata</a></b> †</li> <li><b><a href="/wiki/Cystoporida" title="Cystoporida">Cystoporida</a></b> †</li> <li><b>Esthonioporata</b> †</li> <li><b><a href="/wiki/Fenestrata" title="Fenestrata">Fenestrata</a></b> †</li> <li><b>Timanodictyina</b><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>c<span class="cite-bracket">]</span></a></sup> †</li> <li><b><a href="/wiki/Trepostomatida" title="Trepostomatida">Trepostomatida</a></b> †</li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Chaetognatha">Phylum <a href="/wiki/Chaetognatha" title="Chaetognatha">Chaetognatha</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=6" title="Edit section: Phylum Chaetognatha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Chaetoblack.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Chaetoblack.png/250px-Chaetoblack.png" decoding="async" width="250" height="92" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Chaetoblack.png/375px-Chaetoblack.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Chaetoblack.png/500px-Chaetoblack.png 2x" data-file-width="985" data-file-height="364" /></a><figcaption><i>Spadella cephaloptera</i>. Order <a href="/wiki/Phragmophora" title="Phragmophora">Phragmophora</a></figcaption></figure> <ul><li><b><a href="/wiki/Aphragmophora" title="Aphragmophora">Aphragmophora</a></b></li> <li><b><a href="/wiki/Phragmophora" title="Phragmophora">Phragmophora</a></b></li> <li><b><a href="/wiki/Protoconodonta" class="mw-redirect" title="Protoconodonta">Protoconodonta</a></b> †</li></ul> <p>Unplaced groups </p> <ul><li>Genus <i><a href="/wiki/Capinatator" title="Capinatator">Capinatator</a></i></li> <li>Genus <i>Eognathacantha</i></li> <li>Genus <i>Protodagitta</i></li> <li>Genus <i><a href="/wiki/Timorebestia" title="Timorebestia">Timorebestia</a></i></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Chordata">Phylum <a href="/wiki/Chordata" class="mw-redirect" title="Chordata">Chordata</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=7" title="Edit section: Phylum Chordata"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Great_White_Shark_(Carcharodon_carcharias)_(32911393995).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg/250px-Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg" decoding="async" width="250" height="155" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg/375px-Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg/500px-Great_White_Shark_%28Carcharodon_carcharias%29_%2832911393995%29.jpg 2x" data-file-width="4701" data-file-height="2908" /></a><figcaption>The <a href="/wiki/Great_white_shark" title="Great white shark">great white shark</a>. Order <a href="/wiki/Lamniformes" title="Lamniformes">Lamniformes</a></figcaption></figure> <p>See <a href="/wiki/List_of_chordate_orders" title="List of chordate orders">List of chordate orders</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Cycliophora">Phylum <a href="/wiki/Cycliophora" class="mw-redirect" title="Cycliophora">Cycliophora</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=8" title="Edit section: Phylum Cycliophora"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:CYC-000249_hab_Symbion_americanus_Paratype.tif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/CYC-000249_hab_Symbion_americanus_Paratype.tif/lossy-page1-250px-CYC-000249_hab_Symbion_americanus_Paratype.tif.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/CYC-000249_hab_Symbion_americanus_Paratype.tif/lossy-page1-375px-CYC-000249_hab_Symbion_americanus_Paratype.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/18/CYC-000249_hab_Symbion_americanus_Paratype.tif/lossy-page1-500px-CYC-000249_hab_Symbion_americanus_Paratype.tif.jpg 2x" data-file-width="1600" data-file-height="1200" /></a><figcaption><i><a href="/wiki/Symbion_americanus" title="Symbion americanus">Symbion americanus</a></i>. Order <a href="/wiki/Symbiida" class="mw-redirect" title="Symbiida">Symbiida</a></figcaption></figure> <p>Class <a href="/wiki/Eucycliophora" class="mw-redirect" title="Eucycliophora">Eucycliophora</a> </p> <ul><li><b><a href="/wiki/Symbiida" class="mw-redirect" title="Symbiida">Symbiida</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Dicyemida">Phylum <a href="/wiki/Dicyemida" title="Dicyemida">Dicyemida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=9" title="Edit section: Phylum Dicyemida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Dicyema_japonicum.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Dicyema_japonicum.png/250px-Dicyema_japonicum.png" decoding="async" width="250" height="185" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Dicyema_japonicum.png/375px-Dicyema_japonicum.png 1.5x, //upload.wikimedia.org/wikipedia/commons/0/0a/Dicyema_japonicum.png 2x" data-file-width="447" data-file-height="331" /></a><figcaption><i><a href="/wiki/Dicyema" title="Dicyema">Dicyema</a> japonicum</i></figcaption></figure> <p>Dicyemida does not contain any established orders but does contain three families: <a href="/wiki/Conocyemidae" title="Conocyemidae">Conocyemidae</a>, <a href="/wiki/Dicyemidae" title="Dicyemidae">Dicyemidae</a> and <a href="/wiki/Kantharellidae" class="mw-redirect" title="Kantharellidae">Kantharellidae</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Echinodermata">Phylum <a href="/wiki/Echinodermata" class="mw-redirect" title="Echinodermata">Echinodermata</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=10" title="Edit section: Phylum Echinodermata"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Common_Sea_Star_(Asterias_rubens)_-_Oslo,_Norway_2021-03-25_(03).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg/250px-Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg" decoding="async" width="250" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg/375px-Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg/500px-Common_Sea_Star_%28Asterias_rubens%29_-_Oslo%2C_Norway_2021-03-25_%2803%29.jpg 2x" data-file-width="3021" data-file-height="2014" /></a><figcaption><i><a href="/wiki/Asterias_rubens" class="mw-redirect" title="Asterias rubens">Asterias rubens</a></i>. Order <a href="/wiki/Forcipulatida" title="Forcipulatida">Forcipulatida</a></figcaption></figure> <p>See <a href="/wiki/List_of_echinoderm_orders" title="List of echinoderm orders">List of echinoderm orders</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Entoprocta">Phylum <a href="/wiki/Entoprocta" title="Entoprocta">Entoprocta</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=11" title="Edit section: Phylum Entoprocta"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Barentsia_ramosa_171739034.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Barentsia_ramosa_171739034.jpg/250px-Barentsia_ramosa_171739034.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Barentsia_ramosa_171739034.jpg/375px-Barentsia_ramosa_171739034.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Barentsia_ramosa_171739034.jpg/500px-Barentsia_ramosa_171739034.jpg 2x" data-file-width="2048" data-file-height="1536" /></a><figcaption>A colony of <i><a href="/wiki/Barentsia" title="Barentsia">Barentsia</a> ramosa</i></figcaption></figure> <p>Entoprocta has no orders but is split into four families; <a href="/wiki/Barentsiidae" title="Barentsiidae">Barentsiidae</a>, <a href="/wiki/Pedicellinidae" title="Pedicellinidae">Pedicellinidae</a>, <a href="/wiki/Loxokalypodidae" title="Loxokalypodidae">Loxokalypodidae</a>, and <a href="/wiki/Loxosomatidae" title="Loxosomatidae">Loxosomatidae</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Gastrotricha">Phylum <a href="/wiki/Gastrotricha" class="mw-redirect" title="Gastrotricha">Gastrotricha</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=12" title="Edit section: Phylum Gastrotricha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Paradasys_subterraneus.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Paradasys_subterraneus.jpg/250px-Paradasys_subterraneus.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Paradasys_subterraneus.jpg/375px-Paradasys_subterraneus.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Paradasys_subterraneus.jpg/500px-Paradasys_subterraneus.jpg 2x" data-file-width="1360" data-file-height="1024" /></a><figcaption><i><a href="/wiki/Paradasys" title="Paradasys">Paradasys</a> subterraneus</i>. Order <a href="/wiki/Macrodasyida" title="Macrodasyida">Macrodasyida</a></figcaption></figure> <ul><li><b><a href="/wiki/Chaetonotida" title="Chaetonotida">Chaetonotida</a></b></li> <li><b><a href="/wiki/Macrodasyida" title="Macrodasyida">Macrodasyida</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Gnathostomulida">Phylum <a href="/wiki/Gnathostomulida" class="mw-redirect" title="Gnathostomulida">Gnathostomulida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=13" title="Edit section: Phylum Gnathostomulida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Gnathostomula_paradoxa_Sylt.tif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Gnathostomula_paradoxa_Sylt.tif/lossy-page1-250px-Gnathostomula_paradoxa_Sylt.tif.jpg" decoding="async" width="250" height="56" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Gnathostomula_paradoxa_Sylt.tif/lossy-page1-375px-Gnathostomula_paradoxa_Sylt.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Gnathostomula_paradoxa_Sylt.tif/lossy-page1-500px-Gnathostomula_paradoxa_Sylt.tif.jpg 2x" data-file-width="1566" data-file-height="353" /></a><figcaption><i>Gnathostomula paradoxa</i>. Order <a href="/wiki/Bursovaginoidea" title="Bursovaginoidea">Bursovaginoidea</a></figcaption></figure> <ul><li><b><a href="/wiki/Bursovaginoidea" title="Bursovaginoidea">Bursovaginoidea</a></b></li> <li><b><a href="/wiki/Filospermoidea" title="Filospermoidea">Filospermoidea</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Hemichordata">Phylum <a href="/wiki/Hemichordata" class="mw-redirect" title="Hemichordata">Hemichordata</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=14" title="Edit section: Phylum Hemichordata"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Expn7509_(38827990365).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/71/Expn7509_%2838827990365%29.jpg/250px-Expn7509_%2838827990365%29.jpg" decoding="async" width="250" height="141" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/71/Expn7509_%2838827990365%29.jpg/375px-Expn7509_%2838827990365%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/71/Expn7509_%2838827990365%29.jpg/500px-Expn7509_%2838827990365%29.jpg 2x" data-file-width="1920" data-file-height="1080" /></a><figcaption>Unknown species of <a href="/wiki/Acorn_worm" title="Acorn worm">acorn worm</a> (class Enteropneusta).</figcaption></figure> <p>The classes <a href="/wiki/Planctosphaeroidea" class="mw-redirect" title="Planctosphaeroidea">Planctosphaeroidea</a> and <a href="/wiki/Enteropneusta" class="mw-redirect" title="Enteropneusta">Enteropneusta</a> do not contain any orders </p><p>Class <a href="/wiki/Pterobranchia" title="Pterobranchia">Pterobranchia</a> </p> <ul><li><b><a href="/wiki/Cephalodiscida" title="Cephalodiscida">Cephalodiscida</a></b></li> <li>Subclass <a href="/wiki/Graptolithina" class="mw-redirect" title="Graptolithina">Graptolithina</a> <ul><li><b><a href="/wiki/Rhabdopleurida" title="Rhabdopleurida">Rhabdopleurida</a></b></li> <li><b>Dendroidea</b> †</li> <li><b>Graptoloidea</b> †</li></ul></li></ul> <p>Unplaced groups </p> <ul><li>Family <a href="/wiki/Cysticamaridae" title="Cysticamaridae">Cysticamaridae</a></li> <li>Family <a href="/wiki/Wimanicrustidae" title="Wimanicrustidae">Wimanicrustidae</a></li> <li>Family <a href="/wiki/Dithecodendridae" title="Dithecodendridae">Dithecodendridae</a></li> <li>Family <a href="/wiki/Cyclograptidae" title="Cyclograptidae">Cyclograptidae</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Kinorhyncha">Phylum <a href="/wiki/Kinorhyncha" title="Kinorhyncha">Kinorhyncha</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=15" title="Edit section: Phylum Kinorhyncha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Echinoderes_marthae_SEM.tif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Echinoderes_marthae_SEM.tif/lossy-page1-250px-Echinoderes_marthae_SEM.tif.jpg" decoding="async" width="250" height="177" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Echinoderes_marthae_SEM.tif/lossy-page1-375px-Echinoderes_marthae_SEM.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Echinoderes_marthae_SEM.tif/lossy-page1-500px-Echinoderes_marthae_SEM.tif.jpg 2x" data-file-width="1161" data-file-height="822" /></a><figcaption><i><a href="/wiki/Echinoderes" title="Echinoderes">Echinoderes</a> marthae</i>. Order <a href="/wiki/Echinorhagata" class="mw-redirect" title="Echinorhagata">Echinorhagata</a></figcaption></figure> <p>Class <a href="/wiki/Cyclorhagida" title="Cyclorhagida">Cyclorhagida</a> </p> <ul><li><b><a href="/wiki/Echinorhagata" class="mw-redirect" title="Echinorhagata">Echinorhagata</a></b></li> <li><b>Kentrorhagata</b></li> <li><b>Xenosomata</b></li></ul> <p>Class <a href="/wiki/Allomalorhagida" title="Allomalorhagida">Allomalorhagida</a> </p> <ul><li><b>Anomoirhaga</b></li></ul> <p>Unplaced groups </p> <ul><li>Genus <i><a href="/wiki/Eokinorhynchus" title="Eokinorhynchus">Eokinorhynchus</a></i></li> <li>Family <a href="/wiki/Pycnophyidae" title="Pycnophyidae">Pycnophyidae</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Loricifera">Phylum <a href="/wiki/Loricifera" title="Loricifera">Loricifera</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=16" title="Edit section: Phylum Loricifera"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Spinoloricus.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Spinoloricus.png/250px-Spinoloricus.png" decoding="async" width="250" height="330" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Spinoloricus.png/375px-Spinoloricus.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Spinoloricus.png/500px-Spinoloricus.png 2x" data-file-width="1040" data-file-height="1374" /></a><figcaption><i><a href="/wiki/Spinoloricus_cinziae" title="Spinoloricus cinziae">Spinoloricus cinziae</a></i>. Order <a href="/wiki/Nanaloricida" class="mw-redirect" title="Nanaloricida">Nanaloricida</a></figcaption></figure> <p>Loricifera has no classes and all species are contained within one order </p> <ul><li><b><a href="/wiki/Nanaloricida" class="mw-redirect" title="Nanaloricida">Nanaloricida</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Micrognathozoa">Phylum <a href="/wiki/Micrognathozoa" class="mw-redirect" title="Micrognathozoa">Micrognathozoa</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=17" title="Edit section: Phylum Micrognathozoa"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Limnognathia_maerski_youtube.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Limnognathia_maerski_youtube.png/250px-Limnognathia_maerski_youtube.png" decoding="async" width="250" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Limnognathia_maerski_youtube.png/375px-Limnognathia_maerski_youtube.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Limnognathia_maerski_youtube.png/500px-Limnognathia_maerski_youtube.png 2x" data-file-width="1425" data-file-height="625" /></a><figcaption><i><a href="/wiki/Limnognathia_maerski" class="mw-redirect" title="Limnognathia maerski">Limnognathia maerski</a></i>. Order <a href="/wiki/Limnognathida" class="mw-redirect" title="Limnognathida">Limnognathida</a></figcaption></figure> <p>Micrognathozoa has no classes and its single species is placed in one order </p> <ul><li><b><a href="/wiki/Limnognathida" class="mw-redirect" title="Limnognathida">Limnognathida</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Mollusca">Phylum <a href="/wiki/Mollusca" title="Mollusca">Mollusca</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=18" title="Edit section: Phylum Mollusca"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Squid_colors_2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Squid_colors_2.jpg/250px-Squid_colors_2.jpg" decoding="async" width="250" height="197" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Squid_colors_2.jpg/375px-Squid_colors_2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Squid_colors_2.jpg/500px-Squid_colors_2.jpg 2x" data-file-width="3750" data-file-height="2960" /></a><figcaption><i><a href="/wiki/Sepioteuthis_sepioidea" class="mw-redirect" title="Sepioteuthis sepioidea">Sepioteuthis sepioidea</a></i>. Order <a href="/wiki/Myopsida" title="Myopsida">Myopsida</a></figcaption></figure> <p>See <a href="/wiki/List_of_mollusc_orders" title="List of mollusc orders">List of mollusc orders</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Nematoda">Phylum <a href="/wiki/Nematoda" class="mw-redirect" title="Nematoda">Nematoda</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=19" title="Edit section: Phylum Nematoda"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:CelegansGoldsteinLabUNC.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6a/CelegansGoldsteinLabUNC.jpg/250px-CelegansGoldsteinLabUNC.jpg" decoding="async" width="250" height="212" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/6/6a/CelegansGoldsteinLabUNC.jpg 1.5x" data-file-width="350" data-file-height="297" /></a><figcaption><i><a href="/wiki/Caenorhabditis_elegans" title="Caenorhabditis elegans">Caenorhabditis elegans</a></i>. Order <a href="/wiki/Rhabditida" title="Rhabditida">Rhabditida</a></figcaption></figure> <p>Nematode taxonomy is far from fully resolved, and different schemes might be used. For this list, Mike Hodda's <i>Phylum Nematoda: a classification, catalogue and index of valid genera, with a census of valid species</i> classification is used.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Class <a href="/wiki/Enoplea" title="Enoplea">Enoplea</a> </p> <ul><li>Subclass <a href="/wiki/Enoplia" title="Enoplia">Enoplia</a> <ul><li>Superorder Enoplica <ul><li><b>Alaimida</b></li> <li><b><a href="/wiki/Enoplida" title="Enoplida">Enoplida</a></b></li> <li><b>Ironida</b></li> <li><b>Trefusiida</b></li> <li><b>Tripyloidida</b></li></ul></li> <li>Superorder Rhaptothyreica <ul><li><b>Rhaptothyreida</b></li></ul></li></ul></li> <li>Subclass Oncholaimia <ul><li><b><a href="/wiki/Oncholaimida" class="mw-redirect" title="Oncholaimida">Oncholaimida</a></b></li></ul></li> <li>Subclass Triplonchia <ul><li><b><a href="/wiki/Triplonchida" title="Triplonchida">Triplonchida</a></b></li> <li><b>Tripylida</b></li></ul></li></ul> <p>Class Dorylaimea </p> <ul><li>Subclass <a href="/wiki/Dorylaimia" title="Dorylaimia">Dorylaimia</a> <ul><li><b><a href="/wiki/Dorylaimida" title="Dorylaimida">Dorylaimida</a></b></li></ul></li> <li>Subclass Bathyodontia <ul><li><b>Bathyodontida</b></li> <li><b><a href="/wiki/Mononchida" title="Mononchida">Mononchida</a></b></li> <li><b><a href="/wiki/Mermithida" title="Mermithida">Mermithida</a></b></li></ul></li> <li>Subclass Trichocephalia <ul><li><b><a href="/wiki/Trichocephalida" title="Trichocephalida">Trichocephalida</a></b></li> <li><b>Marimermithida</b></li> <li><b>Dioctophymatida</b></li> <li><b><a href="/wiki/Muspiceida" title="Muspiceida">Muspiceida</a></b></li></ul></li></ul> <p>Class <a href="/wiki/Chromadorea" title="Chromadorea">Chromadorea</a> </p> <ul><li>Subclass <a href="/wiki/Chromadoria" class="mw-redirect" title="Chromadoria">Chromadoria</a> <ul><li><b><a href="/wiki/Chromadorida" title="Chromadorida">Chromadorida</a></b></li> <li><b>Selachinematida</b></li> <li><b><a href="/wiki/Desmodorida" title="Desmodorida">Desmodorida</a></b></li> <li><b><a href="/wiki/Desmoscolecida" class="mw-redirect" title="Desmoscolecida">Desmoscolecida</a></b></li></ul></li> <li>Subclass Plectia <ul><li>Superorder Monhysterica <ul><li><b><a href="/wiki/Monhysterida" title="Monhysterida">Monhysterida</a></b></li></ul></li> <li>Superorder Plectica <ul><li><b><a href="/wiki/Leptolaimida" title="Leptolaimida">Leptolaimida</a></b></li> <li><b><a href="/wiki/Plectida" title="Plectida">Plectida</a></b></li> <li><b><a href="/wiki/Benthimermithida" title="Benthimermithida">Benthimermithida</a></b></li></ul></li> <li>Superorder Teratocephalica <ul><li><b>Teratocephalida</b></li></ul></li> <li>Superorder Rhabditica <ul><li><b><a href="/wiki/Diplogasterida" title="Diplogasterida">Diplogasterida</a></b></li> <li><b><a href="/wiki/Rhabditida" title="Rhabditida">Rhabditida</a></b></li> <li><b><a href="/wiki/Spirurida" title="Spirurida">Spirurida</a></b></li> <li><b>Rhigonematida</b></li> <li><b>Panagrolaimida</b></li> <li><b>Drilonematida</b></li></ul></li></ul></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Nematomorpha">Phylum <a href="/wiki/Nematomorpha" title="Nematomorpha">Nematomorpha</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=20" title="Edit section: Phylum Nematomorpha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Paragordius_tricuspidatus.jpeg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Paragordius_tricuspidatus.jpeg/250px-Paragordius_tricuspidatus.jpeg" decoding="async" width="250" height="171" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Paragordius_tricuspidatus.jpeg/375px-Paragordius_tricuspidatus.jpeg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Paragordius_tricuspidatus.jpeg/500px-Paragordius_tricuspidatus.jpeg 2x" data-file-width="2484" data-file-height="1698" /></a><figcaption><i><a href="/wiki/Paragordius" title="Paragordius">Paragordius</a> tricuspidatus</i>. Order <a href="/wiki/Gordioidea" title="Gordioidea">Gordioidea</a></figcaption></figure> <ul><li><b><a href="/wiki/Gordioidea" title="Gordioidea">Gordioidea</a></b></li> <li><b><a href="/wiki/Nectonematoidea" class="mw-redirect" title="Nectonematoidea">Nectonematoidea</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Nemertea">Phylum <a href="/wiki/Nemertea" title="Nemertea">Nemertea</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=21" title="Edit section: Phylum Nemertea"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Five-lined_Ribbon_Worm_(Baseodiscus_quinquelineatus)_(15622965514).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg/250px-Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg/375px-Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/80/Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg/500px-Five-lined_Ribbon_Worm_%28Baseodiscus_quinquelineatus%29_%2815622965514%29.jpg 2x" data-file-width="4608" data-file-height="3456" /></a><figcaption><i><a href="/wiki/Baseodiscus" title="Baseodiscus">Baseodiscus</a> quinquelineatus</i>. Order <a href="/wiki/Heteronemertea" title="Heteronemertea">Heteronemertea</a></figcaption></figure> <p>Class <a href="/wiki/Hoplonemertea" title="Hoplonemertea">Hoplonemertea</a> </p> <ul><li><b><a href="/wiki/Monostilifera" title="Monostilifera">Monostilifera</a></b></li> <li><b><a href="/wiki/Polystilifera" title="Polystilifera">Polystilifera</a></b></li></ul> <p>Class <a href="/wiki/Palaeonemertea" title="Palaeonemertea">Palaeonemertea</a> </p> <ul><li><b>Archinemertea</b></li> <li><b>Carinomiformes</b></li> <li><b><a href="/wiki/Tubulaniformes" title="Tubulaniformes">Tubulaniformes</a></b></li></ul> <p>Class <a href="/wiki/Pilidiophora" class="mw-redirect" title="Pilidiophora">Pilidiophora</a> </p> <ul><li><b><a href="/wiki/Heteronemertea" title="Heteronemertea">Heteronemertea</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Onychophora">Phylum <a href="/wiki/Onychophora" title="Onychophora">Onychophora</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=22" title="Edit section: Phylum Onychophora"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Epiperipatus_biolleyi.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Epiperipatus_biolleyi.png/250px-Epiperipatus_biolleyi.png" decoding="async" width="250" height="224" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Epiperipatus_biolleyi.png/375px-Epiperipatus_biolleyi.png 1.5x, //upload.wikimedia.org/wikipedia/commons/d/d6/Epiperipatus_biolleyi.png 2x" data-file-width="434" data-file-height="389" /></a><figcaption><i><a href="/wiki/Epiperipatus" title="Epiperipatus">Epiperipatus</a> biolleyi</i></figcaption></figure> <p>Onychophora contains no classes and no orders, but is split into two living families; <a href="/wiki/Peripatidae" title="Peripatidae">Peripatidae</a> and <a href="/wiki/Peripatopsidae" title="Peripatopsidae">Peripatopsidae</a>, and 5 extinct genera; <i><a href="/wiki/Antennacanthopodia" title="Antennacanthopodia">Antennacanthopodia</a></i>, <i>Antennipatus</i>, <i><a href="/wiki/Helenodora" title="Helenodora">Helenodora</a></i>, <i><a href="/wiki/Succinipatopsis" title="Succinipatopsis">Succinipatopsis</a></i>, and <i><a href="/wiki/Tertiapatus" title="Tertiapatus">Tertiapatus</a></i>. </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Orthonectida">Phylum <a href="/wiki/Orthonectida" title="Orthonectida">Orthonectida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=23" title="Edit section: Phylum Orthonectida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:EB1911_Mesozoa_-_Rhopalura_giardii.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/EB1911_Mesozoa_-_Rhopalura_giardii.jpg/250px-EB1911_Mesozoa_-_Rhopalura_giardii.jpg" decoding="async" width="250" height="334" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/EB1911_Mesozoa_-_Rhopalura_giardii.jpg/375px-EB1911_Mesozoa_-_Rhopalura_giardii.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e6/EB1911_Mesozoa_-_Rhopalura_giardii.jpg/500px-EB1911_Mesozoa_-_Rhopalura_giardii.jpg 2x" data-file-width="594" data-file-height="794" /></a><figcaption>A drawing of <i>Rhopalura giardii</i></figcaption></figure> <p>Orthonectida contains no classes or orders, but is split into two families; <a href="/wiki/Pelmatosphaeridae" class="mw-redirect" title="Pelmatosphaeridae">Pelmatosphaeridae</a> and <a href="/wiki/Rhopaluridae" title="Rhopaluridae">Rhopaluridae</a> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Phoronida">Phylum <a href="/wiki/Phoronida" class="mw-redirect" title="Phoronida">Phoronida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=24" title="Edit section: Phylum Phoronida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Phoronopsis_harmeri_611.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Phoronopsis_harmeri_611.jpg/250px-Phoronopsis_harmeri_611.jpg" decoding="async" width="250" height="250" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Phoronopsis_harmeri_611.jpg/375px-Phoronopsis_harmeri_611.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/Phoronopsis_harmeri_611.jpg/500px-Phoronopsis_harmeri_611.jpg 2x" data-file-width="1503" data-file-height="1503" /></a><figcaption><i>Phoronopsis harmeri</i></figcaption></figure> <p>Phoronida contains no classes, orders, or families, but is split into two genera; <i><a href="/wiki/Phoronis" title="Phoronis">Phoronis</a></i> and <i><a href="/wiki/Phoronopsis" title="Phoronopsis">Phoronopsis</a></i> </p> <div class="mw-heading mw-heading3"><h3 id="Phylum_Platyhelminthes">Phylum <a href="/wiki/Platyhelminthes" class="mw-redirect" title="Platyhelminthes">Platyhelminthes</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=25" title="Edit section: Phylum Platyhelminthes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Flatworm_Pseudoceros_ferrugineus_-_Bunaken,_Sulawesi,_Indonesia.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg/250px-Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg" decoding="async" width="250" height="169" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg/375px-Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/00/Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg/500px-Flatworm_Pseudoceros_ferrugineus_-_Bunaken%2C_Sulawesi%2C_Indonesia.jpg 2x" data-file-width="2267" data-file-height="1529" /></a><figcaption><i><a href="/wiki/Pseudoceros" title="Pseudoceros">Pseudoceros</a> ferrugineus</i>. Order <a href="/wiki/Polycladida" title="Polycladida">Polycladida</a></figcaption></figure> <p>The class <a href="/wiki/Catenulida" title="Catenulida">Catenulida</a> contains no orders. </p><p>Subphylum <a href="/wiki/Rhabditophora" title="Rhabditophora">Rhabditophora</a> </p> <ul><li>Clade <a href="/wiki/Macrostomorpha" title="Macrostomorpha">Macrostomorpha</a> <ul><li><b><a href="/wiki/Macrostomida" class="mw-redirect" title="Macrostomida">Macrostomida</a></b></li></ul></li> <li>Clade <a href="/wiki/Trepaxonemata" title="Trepaxonemata">Trepaxonemata</a> <ul><li><b>Gnosonesimida</b></li> <li>Clade <a href="/wiki/Amplimatricata" class="mw-redirect" title="Amplimatricata">Amplimatricata</a> <ul><li><b><a href="/wiki/Lecithoepitheliata" title="Lecithoepitheliata">Lecithoepitheliata</a></b></li> <li><b><a href="/wiki/Polycladida" title="Polycladida">Polycladida</a></b></li></ul></li> <li>Clade Euneoophora <ul><li><b><a href="/wiki/Proseriata" title="Proseriata">Proseriata</a></b></li> <li><b><a href="/wiki/Rhabdocoela" title="Rhabdocoela">Rhabdocoela</a></b></li> <li>Clade Acentrosomata <ul><li>Clade Adiaphanida <ul><li><b><a href="/wiki/Prolecithophora" title="Prolecithophora">Prolecithophora</a></b></li> <li><b><a href="/wiki/Fecampiida" title="Fecampiida">Fecampiida</a></b></li> <li><b><a href="/wiki/Tricladida" class="mw-redirect" title="Tricladida">Tricladida</a></b></li></ul></li> <li>Clade <a href="/wiki/Bothrioneodermata" title="Bothrioneodermata">Bothrioneodermata</a> <ul><li><b><a href="/wiki/Bothrioplanida" class="mw-redirect" title="Bothrioplanida">Bothrioplanida</a></b></li> <li>Superclass <a href="/wiki/Neodermata" title="Neodermata">Neodermata</a> <ul><li>Class <a href="/wiki/Cestoda" title="Cestoda">Cestoda</a> <ul><li>Subclass <a href="/wiki/Cestodaria" title="Cestodaria">Cestodaria</a> <ul><li><b><a href="/wiki/Amphilinidea" class="mw-redirect" title="Amphilinidea">Amphilinidea</a></b></li> <li><b><a href="/wiki/Gyrocotylidea" title="Gyrocotylidea">Gyrocotylidea</a></b></li></ul></li> <li>Subclass <a href="/wiki/Eucestoda" title="Eucestoda">Eucestoda</a> <ul><li><b><a href="/wiki/Spathebothriidea" title="Spathebothriidea">Spathebothriidea</a></b></li> <li><b><a href="/wiki/Caryophyllidea" title="Caryophyllidea">Caryophyllidea</a></b></li> <li><b><a href="/wiki/Haplobothriidea" title="Haplobothriidea">Haplobothriidea</a></b></li> <li><b><a href="/wiki/Diphyllobothriidea" title="Diphyllobothriidea">Diphyllobothriidea</a></b></li> <li><b><a href="/wiki/Diphyllidea" title="Diphyllidea">Diphyllidea</a></b></li> <li><b><a href="/wiki/Trypanorhyncha" title="Trypanorhyncha">Trypanorhyncha</a></b></li> <li><b><a href="/wiki/Bothriocephalidea" title="Bothriocephalidea">Bothriocephalidea</a></b></li> <li><b><a href="/wiki/Litobothriidea" title="Litobothriidea">Litobothriidea</a></b></li> <li><b><a href="/wiki/Lecanicephaloidea" title="Lecanicephaloidea">Lecanicephaloidea</a></b></li> <li><b><a href="/wiki/Rhinebothriidea" title="Rhinebothriidea">Rhinebothriidea</a></b></li> <li><b><a href="/wiki/Tetraphyllidea" title="Tetraphyllidea">Tetraphyllidea</a></b></li> <li><b><a href="/wiki/Onchoproteocephalidea" title="Onchoproteocephalidea">Onchoproteocephalidea</a></b></li> <li><b><a href="/wiki/Nippotaeniidea" title="Nippotaeniidea">Nippotaeniidea</a></b></li> <li><b><a href="/wiki/Tetrabothriidea" title="Tetrabothriidea">Tetrabothriidea</a></b></li> <li><b><a href="/wiki/Cyclophyllidea" title="Cyclophyllidea">Cyclophyllidea</a></b></li></ul></li></ul></li> <li>Class <a href="/wiki/Monogenea" title="Monogenea">Monogenea</a> <ul><li>Subclass <a href="/wiki/Monopisthocotylea" title="Monopisthocotylea">Monopisthocotylea</a> <ul><li><b><a href="/wiki/Monocotylidea" class="mw-redirect" title="Monocotylidea">Monocotylidea</a></b></li> <li><b><a href="/wiki/Capsalidea" title="Capsalidea">Capsalidea</a></b></li> <li><b>Lagarocotylidea</b></li> <li><b><a href="/wiki/Montchadskyellidea" class="mw-redirect" title="Montchadskyellidea">Montchadskyellidea</a></b></li> <li><b><a href="/wiki/Gyrodactylidea" title="Gyrodactylidea">Gyrodactylidea</a></b></li> <li><b><a href="/wiki/Dactylogyridea" title="Dactylogyridea">Dactylogyridea</a></b></li></ul></li> <li>Subclass <a href="/wiki/Polyopisthocotylea" title="Polyopisthocotylea">Polyopisthocotylea</a> <ul><li><b><a href="/wiki/Polystomatidea" class="mw-redirect" title="Polystomatidea">Polystomatidea</a></b></li> <li><b><a href="/wiki/Chimaericolidea" class="mw-redirect" title="Chimaericolidea">Chimaericolidea</a></b></li> <li><b><a href="/wiki/Diclybothriidea" title="Diclybothriidea">Diclybothriidea</a></b></li> <li><b><a href="/wiki/Mazocraeidea" title="Mazocraeidea">Mazocraeidea</a></b></li></ul></li></ul></li> <li>Class <a href="/wiki/Trematoda" title="Trematoda">Trematoda</a> <ul><li>Subclass <a href="/wiki/Aspidogastrea" title="Aspidogastrea">Aspidogastrea</a> <ul><li><b><a href="/wiki/Aspidogastrida" title="Aspidogastrida">Aspidogastrida</a></b></li> <li><b><a href="/wiki/Stichocotylida" class="mw-redirect" title="Stichocotylida">Stichocotylida</a></b></li></ul></li> <li>Subclass <a href="/wiki/Digenea" title="Digenea">Digenea</a> <ul><li><b><a href="/wiki/Diplostomida" title="Diplostomida">Diplostomida</a></b></li> <li><b><a href="/wiki/Plagiorchiida" title="Plagiorchiida">Plagiorchiida</a></b></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul> <p>Unplaced groups </p> <ul><li>Genus <i><a href="/wiki/Haplopharynx" title="Haplopharynx">Haplopharynx</a></i></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Priapulida">Phylum <a href="/wiki/Priapulida" title="Priapulida">Priapulida</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=26" title="Edit section: Phylum Priapulida"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Adult_priapulid.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Adult_priapulid.jpg/250px-Adult_priapulid.jpg" decoding="async" width="250" height="333" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Adult_priapulid.jpg/375px-Adult_priapulid.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/01/Adult_priapulid.jpg/500px-Adult_priapulid.jpg 2x" data-file-width="1944" data-file-height="2592" /></a><figcaption><i><a href="/wiki/Priapulus" title="Priapulus">Priapulus</a> caudatus</i>. Order <a href="/wiki/Priapulimorphida" title="Priapulimorphida">Priapulimorphida</a></figcaption></figure> <p>Several stem group priapulid genera are not classified within any established orders. The orders listed below are solely crown priapulids. </p> <ul><li><b><a href="/wiki/Halicryptomorphida" class="mw-redirect" title="Halicryptomorphida">Halicryptomorphida</a></b></li> <li><b><a href="/wiki/Priapulimorphida" title="Priapulimorphida">Priapulimorphida</a></b></li> <li><b>Meiopriapulomorpha</b></li> <li><b><a href="/wiki/Seticoronaria" class="mw-redirect" title="Seticoronaria">Seticoronaria</a></b><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>d<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Rotifera">Phylum <a href="/wiki/Rotifera" class="mw-redirect" title="Rotifera">Rotifera</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=27" title="Edit section: Phylum Rotifera"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Habrotrocha_rosa_1.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Habrotrocha_rosa_1.jpg/250px-Habrotrocha_rosa_1.jpg" decoding="async" width="250" height="253" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Habrotrocha_rosa_1.jpg/375px-Habrotrocha_rosa_1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/6/66/Habrotrocha_rosa_1.jpg 2x" data-file-width="500" data-file-height="506" /></a><figcaption><i><a href="/wiki/Habrotrocha_rosa" title="Habrotrocha rosa">Habrotrocha rosa</a></i>. Order Philodinida</figcaption></figure> <p>The group <a href="/wiki/Acanthocephala" title="Acanthocephala">Acanthocephala</a> is traditionally treated as a separate phylum from Rotifera. However, it was found that Acanthocephala are <a href="/wiki/Phylogenetics" title="Phylogenetics">phylogenetically</a> contained within the rotifers, and this list reflects these findings. </p> <ul><li><b><a href="/wiki/Seisonida" class="mw-redirect" title="Seisonida">Seisonida</a></b></li></ul> <p>Superclass <a href="/wiki/Eurotatoria" title="Eurotatoria">Eurotatoria</a> </p> <ul><li>Class <a href="/wiki/Bdelloidea" title="Bdelloidea">Bdelloidea</a> <ul><li><b>Adinetida</b></li> <li><b>Philodinavida</b></li> <li><b><a href="/wiki/Philodinida" class="mw-redirect" title="Philodinida">Philodinida</a></b></li></ul></li> <li>Class <a href="/wiki/Monogononta" title="Monogononta">Monogononta</a> <ul><li><b><a href="/wiki/Collothecaceae" title="Collothecaceae">Collothecaceae</a></b></li> <li><b><a href="/wiki/Flosculariaceae" title="Flosculariaceae">Flosculariaceae</a></b></li> <li><b><a href="/wiki/Ploima" title="Ploima">Ploima</a></b></li></ul></li></ul> <p>Clade <a href="/wiki/Acanthocephala" title="Acanthocephala">Acanthocephala</a> </p> <ul><li>Class <a href="/wiki/Archiacanthocephala" title="Archiacanthocephala">Archiacanthocephala</a> <ul><li><b><a href="/wiki/Apororhynchida" class="mw-redirect" title="Apororhynchida">Apororhynchida</a></b></li> <li><b><a href="/wiki/Gigantorhynchida" class="mw-redirect" title="Gigantorhynchida">Gigantorhynchida</a></b></li> <li><b><a href="/wiki/Moniliformida" class="mw-redirect" title="Moniliformida">Moniliformida</a></b></li> <li><b><a href="/wiki/Oligacanthorhynchida" class="mw-redirect" title="Oligacanthorhynchida">Oligacanthorhynchida</a></b></li></ul></li> <li>Class <a href="/wiki/Eoacanthocephala" title="Eoacanthocephala">Eoacanthocephala</a> <ul><li><b><a href="/wiki/Gyracanthocephala" class="mw-redirect" title="Gyracanthocephala">Gyracanthocephala</a></b></li> <li><b><a href="/wiki/Neoechinorhynchida" title="Neoechinorhynchida">Neoechinorhynchida</a></b></li></ul></li> <li>Class <a href="/wiki/Palaeacanthocephala" title="Palaeacanthocephala">Palaeacanthocephala</a> <ul><li><b><a href="/wiki/Echinorhynchida" title="Echinorhynchida">Echinorhynchida</a></b></li> <li><b><a href="/wiki/Heteramorphida" class="mw-redirect" title="Heteramorphida">Heteramorphida</a></b></li> <li><b><a href="/wiki/Polymorphida" title="Polymorphida">Polymorphida</a></b></li></ul></li> <li><b><a href="/wiki/Polyacanthorhynchida" class="mw-redirect" title="Polyacanthorhynchida">Polyacanthorhynchida</a></b></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Tardigrada">Phylum <a href="/wiki/Tardigrada" class="mw-redirect" title="Tardigrada">Tardigrada</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=28" title="Edit section: Phylum Tardigrada"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Tardigrade_Acutuncus_Antarcticus.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Tardigrade_Acutuncus_Antarcticus.jpg/250px-Tardigrade_Acutuncus_Antarcticus.jpg" decoding="async" width="250" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Tardigrade_Acutuncus_Antarcticus.jpg/375px-Tardigrade_Acutuncus_Antarcticus.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Tardigrade_Acutuncus_Antarcticus.jpg/500px-Tardigrade_Acutuncus_Antarcticus.jpg 2x" data-file-width="700" data-file-height="501" /></a><figcaption><i><a href="/wiki/Acutuncus_antarcticus" class="mw-redirect" title="Acutuncus antarcticus">Acutuncus antarcticus</a></i>. Order <a href="/wiki/Parachela_(tardigrade)" title="Parachela (tardigrade)">Parachela</a></figcaption></figure> <p>The class <a href="/wiki/Mesotardigrada" title="Mesotardigrada">Mesotardigrada</a> contains one species, <i>Thermozodium esakii</i>, which has not been found since its reported discovery in 1937, and its existence is dubious. It is contained within the order <b>Thermozodia</b>. </p> <ul><li>Class <a href="/wiki/Eutardigrada" class="mw-redirect" title="Eutardigrada">Eutardigrada</a> <ul><li><b><a href="/wiki/Apochela" class="mw-redirect" title="Apochela">Apochela</a></b></li> <li><b><a href="/wiki/Parachela_(tardigrade)" title="Parachela (tardigrade)">Parachela</a></b></li></ul></li> <li>Class <a href="/wiki/Heterotardigrada" title="Heterotardigrada">Heterotardigrada</a> <ul><li><b><a href="/wiki/Arthrotardigrada" title="Arthrotardigrada">Arthrotardigrada</a></b></li> <li><b><a href="/wiki/Echiniscoidea" title="Echiniscoidea">Echiniscoidea</a></b></li></ul></li></ul> <div class="mw-heading mw-heading3"><h3 id="Phylum_Xenacoelomorpha">Phylum <a href="/wiki/Xenacoelomorpha" title="Xenacoelomorpha">Xenacoelomorpha</a></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=29" title="Edit section: Phylum Xenacoelomorpha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Neochildia_fusca.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Neochildia_fusca.jpg/250px-Neochildia_fusca.jpg" decoding="async" width="250" height="134" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Neochildia_fusca.jpg/375px-Neochildia_fusca.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/Neochildia_fusca.jpg/500px-Neochildia_fusca.jpg 2x" data-file-width="929" data-file-height="499" /></a><figcaption><i><a href="/wiki/Neochildia" title="Neochildia">Neochildia</a> fusca</i>. Order <a href="/wiki/Acoela" title="Acoela">Acoela</a></figcaption></figure> <p>The subphylum <a href="/wiki/Xenoturbellida" class="mw-redirect" title="Xenoturbellida">Xenoturbellida</a> does not contain any classes or orders. It's only family is Xenoturbellidae which contains one genus, <i>Xenoturbella</i>. </p> <ul><li>Subphylum <a href="/wiki/Acoelomorpha" title="Acoelomorpha">Acoelomorpha</a> <ul><li><b><a href="/wiki/Acoela" title="Acoela">Acoela</a></b></li></ul></li></ul> <p>The class <a href="/wiki/Nemertodermatida" title="Nemertodermatida">Nemertodermatida</a> does not contain any orders, but does contain two families; <a href="/wiki/Ascopariidae" title="Ascopariidae">Ascopariidae</a> and <a href="/wiki/Nemertodermatidae" title="Nemertodermatidae">Nemertodermatidae</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=30" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-alpha"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">This order traditionally also includes the families Maldanidae and Arenicolidae, but is now believed to only contain Echiura and family Capitellidae. Maldanidae and Arenicolidae have been moved to the clade Maldanomorpha</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">This family is traditionally placed in the order Sabellida, but is now considered to be closest to Cirratuliformia and as such is now unplaced</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">May be a suborder of Cryptostomata</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">Sometimes treated as a class</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_bilaterian_orders&action=edit&section=31" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFHodda2022" class="citation journal cs1">Hodda, M. (2022). <a rel="nofollow" class="external text" href="https://doi.org/10.11646%2Fzootaxa.5114.1.1">"Phylum Nematoda: a classification, catalogue and index of valid genera, with a census of valid species"</a>. <i>Zootaxa</i>. <b>5114</b> (1): 1–289. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.11646%2Fzootaxa.5114.1.1">10.11646/zootaxa.5114.1.1</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/35391386">35391386</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Zootaxa&rft.atitle=Phylum+Nematoda%3A+a+classification%2C+catalogue+and+index+of+valid+genera%2C+with+a+census+of+valid+species&rft.volume=5114&rft.issue=1&rft.pages=1-289&rft.date=2022&rft_id=info%3Adoi%2F10.11646%2Fzootaxa.5114.1.1&rft_id=info%3Apmid%2F35391386&rft.aulast=Hodda&rft.aufirst=M.&rft_id=https%3A%2F%2Fdoi.org%2F10.11646%252Fzootaxa.5114.1.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AList+of+bilaterian+orders" class="Z3988"></span></span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=List_of_bilaterian_orders&oldid=1256991620">https://en.wikipedia.org/w/index.php?title=List_of_bilaterian_orders&oldid=1256991620</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Bilaterian_orders" title="Category:Bilaterian orders">Bilaterian orders</a></li><li><a href="/wiki/Category:Taxonomic_lists_(orders)" title="Category:Taxonomic lists (orders)">Taxonomic lists (orders)</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 12 November 2024, at 16:38<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. By using this site, you agree to the <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use" class="extiw" title="foundation:Special:MyLanguage/Policy:Terms of Use">Terms of Use</a> and <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy" class="extiw" title="foundation:Special:MyLanguage/Policy:Privacy policy">Privacy Policy</a>. Wikipedia® is a registered trademark of the <a rel="nofollow" class="external text" href="https://wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, a non-profit organization.</li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:About">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:General_disclaimer">Disclaimers</a></li> <li id="footer-places-contact"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-mobileview"><a href="//en.m.wikipedia.org/w/index.php?title=List_of_bilaterian_orders&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobile view</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-f69cdc8f6-szq4t","wgBackendResponseTime":174,"wgPageParseReport":{"limitreport":{"cputime":"0.256","walltime":"0.364","ppvisitednodes":{"value":892,"limit":1000000},"postexpandincludesize":{"value":4575,"limit":2097152},"templateargumentsize":{"value":914,"limit":2097152},"expansiondepth":{"value":9,"limit":100},"expensivefunctioncount":{"value":1,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":7428,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 189.823 1 -total"," 52.82% 100.259 2 Template:Reflist"," 43.31% 82.216 1 Template:Cite_journal"," 40.38% 76.658 1 Template:Short_description"," 20.37% 38.671 2 Template:Pagetype"," 12.69% 24.096 5 Template:Main_other"," 11.20% 21.267 1 Template:SDcat"," 9.84% 18.678 1 Template:Notelist"," 3.79% 7.197 4 Template:Efn"," 2.55% 4.842 1 Template:Short_description/lowercasecheck"]},"scribunto":{"limitreport-timeusage":{"value":"0.086","limit":"10.000"},"limitreport-memusage":{"value":2936892,"limit":52428800}},"cachereport":{"origin":"mw-web.eqiad.main-5dc468848-mlbg6","timestamp":"20241122152231","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"List of bilaterian orders","url":"https:\/\/en.wikipedia.org\/wiki\/List_of_bilaterian_orders","sameAs":"http:\/\/www.wikidata.org\/entity\/Q20969877","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q20969877","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2015-09-13T17:20:11Z","dateModified":"2024-11-12T16:38:43Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/3\/3b\/AnimalsRelativeNumbers.png","headline":"Wikimedia list article"}</script> </body> </html>