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-disabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>Sea urchin - Simple English Wikipedia, the free encyclopedia</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-disabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )simplewikimwclientpreferences=([^;]+)/);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":"95058fa1-9cc3-4c52-877d-335dcfe71319","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Sea_urchin","wgTitle":"Sea urchin","wgCurRevisionId":9521397,"wgRevisionId":9521397,"wgArticleId":33124,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["Pages using the JsonConfig extension","CS1 maint: multiple names: authors list","CS1 errors: missing periodical","Articles with 'species' microformats","Taxobox articles missing a taxonbar","Echinoderms"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Sea_urchin","wgRelevantArticleId":33124,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject": "wikipedia","wgCiteReferencePreviewsActive":false,"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":true,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":7000,"wgRelatedArticlesCompat":[],"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q83483","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","mediawiki.action.styles":"ready","mediawiki.interface.helpers.styles":"ready","mediawiki.codex.messagebox.styles":"ready","ext.cite.styles":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","jquery.makeCollapsible.styles":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.cite.ux-enhancements","mediawiki.page.media","site","mediawiki.page.ready","jquery.makeCollapsible","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.refToolbar","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"];</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%7Cjquery.makeCollapsible.styles%7Cmediawiki.action.styles%7Cmediawiki.codex.messagebox.styles%7Cmediawiki.interface.helpers.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.6"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="noindex,nofollow,max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/1200px-SeaUrchin.jpg"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="1600"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/800px-SeaUrchin.jpg"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="1067"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/640px-SeaUrchin.jpg"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="853"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="Sea urchin - Simple English Wikipedia, the free encyclopedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//simple.m.wikipedia.org/wiki/Sea_urchin"> <link rel="alternate" type="application/x-wiki" title="change this page" href="/w/index.php?title=Sea_urchin&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="//simple.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://simple.wikipedia.org/wiki/Sea_urchin"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.simple"> <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-Sea_urchin rootpage-Sea_urchin 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"> Getting around </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-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Simple_start" title="About the project, what you can do, where to find things"><span>Simple start</span></a></li><li id="n-Simple-talk" class="mw-list-item"><a href="/wiki/Wikipedia:Simple_talk"><span>Simple talk</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="The list of new changes in the wiki. [r]" accesskey="r"><span>New changes</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Show any page [x]" accesskey="x"><span>Show any page</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="The place to get help"><span>Help</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//simple.wikipedia.org/wiki/Wikipedia:Contact_us"><span>Contact us</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About"><span>About Wikipedia</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-simple.svg" width="101" height="18" style="width: 6.3125em; height: 1.125em;"> </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/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=simple.wikipedia.org&uselang=en" class=""><span>Give to Wikipedia</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=Sea+urchin&returntoquery=oldid%3D9521397" 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=Sea+urchin&returntoquery=oldid%3D9521397" title="You are encouraged to log in; however, it is 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="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/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=simple.wikipedia.org&uselang=en"><span>Give to Wikipedia</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Sea+urchin&returntoquery=oldid%3D9521397" 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=Sea+urchin&returntoquery=oldid%3D9521397" title="You are encouraged to log in; however, it is 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 changes 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">Beginning</div> </a> </li> <li id="toc-Spines" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Spines"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Spines</span> </div> </a> <ul id="toc-Spines-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Teeth" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Teeth"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Teeth</span> </div> </a> <ul id="toc-Teeth-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Ecology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Ecology"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Ecology</span> </div> </a> <ul id="toc-Ecology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fossil_record_and_evolution" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Fossil_record_and_evolution"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Fossil record and evolution</span> </div> </a> <ul id="toc-Fossil_record_and_evolution-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sea_urchins_as_food" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Sea_urchins_as_food"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Sea urchins as food</span> </div> </a> <ul id="toc-Sea_urchins_as_food-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">6</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">Sea urchin</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 88 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-88" 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">88 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Afrikaans" lang="af" hreflang="af" data-title="Echinoidea" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%82%D9%86%D9%81%D8%B0_%D8%A7%D9%84%D8%A8%D8%AD%D8%B1" title="قنفذ البحر – Arabic" lang="ar" hreflang="ar" data-title="قنفذ البحر" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Equinoidea" title="Equinoidea – Asturian" lang="ast" hreflang="ast" data-title="Equinoidea" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/D%C9%99niz_kirpil%C9%99ri" title="Dəniz kirpiləri – Azerbaijani" lang="az" hreflang="az" data-title="Dəniz kirpiləri" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%AF%D9%86%DB%8C%D8%B2_%DA%A9%DB%8C%D8%B1%D9%BE%DB%8C%D9%84%D8%B1%DB%8C" title="دنیز کیرپیلری – South Azerbaijani" lang="azb" hreflang="azb" data-title="دنیز کیرپیلری" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9C%D0%B0%D1%80%D1%81%D0%BA%D1%96%D1%8F_%D0%B2%D0%BE%D0%B6%D1%8B%D0%BA%D1%96" title="Марскія вожыкі – Belarusian" lang="be" hreflang="be" data-title="Марскія вожыкі" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%9C%D0%B0%D1%80%D1%81%D0%BA%D1%96%D1%8F_%D0%B2%D0%BE%D0%B6%D1%8B%D0%BA%D1%96" title="Марскія вожыкі – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Марскія вожыкі" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Tayom" title="Tayom – Central Bikol" lang="bcl" hreflang="bcl" data-title="Tayom" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9C%D0%BE%D1%80%D1%81%D0%BA%D0%B8_%D1%82%D0%B0%D1%80%D0%B0%D0%BB%D0%B5%D0%B6%D0%B8" title="Морски таралежи – Bulgarian" lang="bg" hreflang="bg" data-title="Морски таралежи" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Morski_je%C5%BEevi" title="Morski ježevi – Bosnian" lang="bs" hreflang="bs" data-title="Morski ježevi" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Teureug" title="Teureug – Breton" lang="br" hreflang="br" data-title="Teureug" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Eri%C3%A7ons_de_mar" title="Eriçons de mar – Catalan" lang="ca" hreflang="ca" data-title="Eriçons de mar" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ceb mw-list-item"><a href="https://ceb.wikipedia.org/wiki/Swakigtuyom" title="Swakigtuyom – Cebuano" lang="ceb" hreflang="ceb" data-title="Swakigtuyom" data-language-autonym="Cebuano" data-language-local-name="Cebuano" class="interlanguage-link-target"><span>Cebuano</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Je%C5%BEovky" title="Ježovky – Czech" lang="cs" hreflang="cs" data-title="Ježovky" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/S%C3%B8pindsvin" title="Søpindsvin – Danish" lang="da" hreflang="da" data-title="Søpindsvin" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Seeigel" title="Seeigel – German" lang="de" hreflang="de" data-title="Seeigel" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-nv mw-list-item"><a href="https://nv.wikipedia.org/wiki/T%C3%A1%C5%82t%C5%82%CA%BC%C3%A1%C3%A1h_adiji%C5%82ii" title="Táłtłʼááh adijiłii – Navajo" lang="nv" hreflang="nv" data-title="Táłtłʼááh adijiłii" data-language-autonym="Diné bizaad" data-language-local-name="Navajo" class="interlanguage-link-target"><span>Diné bizaad</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Merisiilikud" title="Merisiilikud – Estonian" lang="et" hreflang="et" data-title="Merisiilikud" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%91%CF%87%CE%B9%CE%BD%CF%8C%CF%82" title="Αχινός – Greek" lang="el" hreflang="el" data-title="Αχινός" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://en.wikipedia.org/wiki/Sea_urchin" title="Sea urchin – English" lang="en" hreflang="en" data-title="Sea urchin" data-language-autonym="English" data-language-local-name="English" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/%D0%92%D0%B5%D0%B4%D1%8C%D1%81%D0%B5%D0%B5%D0%BB%D1%8C" title="Ведьсеель – Erzya" lang="myv" hreflang="myv" data-title="Ведьсеель" data-language-autonym="Эрзянь" data-language-local-name="Erzya" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Spanish" lang="es" hreflang="es" data-title="Echinoidea" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/E%C4%A5ino" title="Eĥino – Esperanto" lang="eo" hreflang="eo" data-title="Eĥino" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Itsas_triku" title="Itsas triku – Basque" lang="eu" hreflang="eu" data-title="Itsas triku" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AA%D9%88%D8%AA%DB%8C%D8%A7%DB%8C_%D8%AF%D8%B1%DB%8C%D8%A7%DB%8C%DB%8C" title="توتیای دریایی – Persian" lang="fa" hreflang="fa" data-title="توتیای دریایی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Echinoidea" title="Echinoidea – French" lang="fr" hreflang="fr" data-title="Echinoidea" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Cu%C3%A1n_mara" title="Cuán mara – Irish" lang="ga" hreflang="ga" data-title="Cuán mara" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Ourizo_de_mar" title="Ourizo de mar – Galician" lang="gl" hreflang="gl" data-title="Ourizo de mar" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%84%B1%EA%B2%8C%EB%A5%98" title="성게류 – Korean" lang="ko" hreflang="ko" data-title="성게류" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BE%D5%B8%D5%BE%D5%B8%D5%A6%D5%B6%D5%AB%D5%B6%D5%A5%D6%80" title="Ծովոզնիներ – Armenian" lang="hy" hreflang="hy" data-title="Ծովոզնիներ" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%9C%E0%A4%B2%E0%A4%B8%E0%A4%BE%E0%A4%B9%E0%A5%80" title="जलसाही – Hindi" lang="hi" hreflang="hi" data-title="जलसाही" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Je%C5%BEinci" title="Ježinci – Croatian" lang="hr" hreflang="hr" data-title="Ježinci" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Ekino" title="Ekino – Ido" lang="io" hreflang="io" data-title="Ekino" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Landak_laut" title="Landak laut – Indonesian" lang="id" hreflang="id" data-title="Landak laut" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/%C3%8Dgulker" title="Ígulker – Icelandic" lang="is" hreflang="is" data-title="Ígulker" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Italian" lang="it" hreflang="it" data-title="Echinoidea" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A7%D7%99%D7%A4%D7%95%D7%93%D7%99_%D7%99%D7%9D" title="קיפודי ים – Hebrew" lang="he" hreflang="he" data-title="קיפודי ים" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%96%E1%83%A6%E1%83%95%E1%83%98%E1%83%A1_%E1%83%96%E1%83%A6%E1%83%90%E1%83%A0%E1%83%91%E1%83%94%E1%83%91%E1%83%98" title="ზღვის ზღარბები – Georgian" lang="ka" hreflang="ka" data-title="ზღვის ზღარბები" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A2%D0%B5%D2%A3%D1%96%D0%B7_%D0%BA%D1%96%D1%80%D0%BF%D1%96%D0%BB%D0%B5%D1%80%D1%96" title="Теңіз кірпілері – Kazakh" lang="kk" hreflang="kk" data-title="Теңіз кірпілері" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%94%D0%B5%D2%A3%D0%B8%D0%B7_%D0%BA%D0%B8%D1%80%D0%BF%D0%B8%D1%81%D0%B8" title="Деңиз кирписи – Kyrgyz" lang="ky" hreflang="ky" data-title="Деңиз кирписи" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-mrj mw-list-item"><a href="https://mrj.wikipedia.org/wiki/%D0%A2%D0%B0%D0%BD%D0%B3%D1%8B%D0%B6_%D1%88%D3%B1%D0%BB%D3%B9" title="Тангыж шӱлӹ – Western Mari" lang="mrj" hreflang="mrj" data-title="Тангыж шӱлӹ" data-language-autonym="Кырык мары" data-language-local-name="Western Mari" class="interlanguage-link-target"><span>Кырык мары</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Latin" lang="la" hreflang="la" data-title="Echinoidea" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/J%C5%ABras_e%C5%BEi" title="Jūras eži – Latvian" lang="lv" hreflang="lv" data-title="Jūras eži" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/J%C5%ABr%C5%B3_e%C5%BEiai" title="Jūrų ežiai – Lithuanian" lang="lt" hreflang="lt" data-title="Jūrų ežiai" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Zie%C3%AB-eechele" title="Zieë-eechele – Limburgish" lang="li" hreflang="li" data-title="Zieë-eechele" data-language-autonym="Limburgs" data-language-local-name="Limburgish" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Ecinoideo" title="Ecinoideo – Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Ecinoideo" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Tengeris%C3%BCn%C3%B6k" title="Tengerisünök – Hungarian" lang="hu" hreflang="hu" data-title="Tengerisünök" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9C%D0%BE%D1%80%D1%81%D0%BA%D0%B8_%D0%B5%D0%B6%D0%BE%D0%B2%D0%B8" title="Морски ежови – Macedonian" lang="mk" hreflang="mk" data-title="Морски ежови" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mg mw-list-item"><a href="https://mg.wikipedia.org/wiki/Soky" title="Soky – Malagasy" lang="mg" hreflang="mg" data-title="Soky" data-language-autonym="Malagasy" data-language-local-name="Malagasy" class="interlanguage-link-target"><span>Malagasy</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%95%E0%B4%9F%E0%B5%BD%E0%B4%9A%E0%B5%8D%E0%B4%9A%E0%B5%87%E0%B4%A8" title="കടൽച്ചേന – Malayalam" lang="ml" hreflang="ml" data-title="കടൽച്ചേന" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D9%82%D9%86%D9%81%D8%B0_%D8%A7%D9%84%D8%A8%D8%AD%D8%B1" title="قنفذ البحر – Egyptian Arabic" lang="arz" hreflang="arz" data-title="قنفذ البحر" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-mnw mw-list-item"><a href="https://mnw.wikipedia.org/wiki/%E1%80%80%E1%81%9E%E1%80%AF%E1%80%81%E1%80%BB" title="ကၞုချ – Mon" lang="mnw" hreflang="mnw" data-title="ကၞုချ" data-language-autonym="ဘာသာမန်" data-language-local-name="Mon" class="interlanguage-link-target"><span>ဘာသာမန်</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Landak_laut" title="Landak laut – Malay" lang="ms" hreflang="ms" data-title="Landak laut" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%9E%E1%80%B6%E1%80%95%E1%80%81%E1%80%BC%E1%80%AF%E1%80%95%E1%80%BA" title="သံပခြုပ် – Burmese" lang="my" hreflang="my" data-title="သံပခြုပ်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Zee-egels" title="Zee-egels – Dutch" lang="nl" hreflang="nl" data-title="Zee-egels" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%A6%E3%83%8B" title="ウニ – Japanese" lang="ja" hreflang="ja" data-title="ウニ" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Siaiigler" title="Siaiigler – Northern Frisian" lang="frr" hreflang="frr" data-title="Siaiigler" data-language-autonym="Nordfriisk" data-language-local-name="Northern Frisian" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Sj%C3%B8piggsvin" title="Sjøpiggsvin – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Sjøpiggsvin" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Kr%C3%A5kebolle" title="Kråkebolle – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Kråkebolle" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Occitan" lang="oc" hreflang="oc" data-title="Echinoidea" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Dengiz_tipratikanlari" title="Dengiz tipratikanlari – Uzbek" lang="uz" hreflang="uz" data-title="Dengiz tipratikanlari" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Je%C5%BCowce" title="Jeżowce – Polish" lang="pl" hreflang="pl" data-title="Jeżowce" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Portuguese" lang="pt" hreflang="pt" data-title="Echinoidea" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Echinoide" title="Echinoide – Romanian" lang="ro" hreflang="ro" data-title="Echinoide" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Yaku_askanku" title="Yaku askanku – Quechua" lang="qu" hreflang="qu" data-title="Yaku askanku" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9C%D0%BE%D1%80%D1%81%D0%BA%D0%B8%D0%B5_%D0%B5%D0%B6%D0%B8" title="Морские ежи – Russian" lang="ru" hreflang="ru" data-title="Морские ежи" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Sea_urchin" title="Sea urchin – Scots" lang="sco" hreflang="sco" data-title="Sea urchin" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Sicilian" lang="scn" hreflang="scn" data-title="Echinoidea" data-language-autonym="Sicilianu" data-language-local-name="Sicilian" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Je%C5%BEovky" title="Ježovky – Slovak" lang="sk" hreflang="sk" data-title="Ježovky" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Morski_je%C5%BEki" title="Morski ježki – Slovenian" lang="sl" hreflang="sl" data-title="Morski ježki" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9C%D0%BE%D1%80%D1%81%D0%BA%D0%B8_%D1%98%D0%B5%D0%B6%D0%B5%D0%B2%D0%B8" title="Морски јежеви – Serbian" lang="sr" hreflang="sr" data-title="Морски јежеви" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Je%C5%BEinci" title="Ježinci – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Ježinci" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Merisiilit" title="Merisiilit – Finnish" lang="fi" hreflang="fi" data-title="Merisiilit" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Sj%C3%B6borrar" title="Sjöborrar – Swedish" lang="sv" hreflang="sv" data-title="Sjöborrar" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Salungo" title="Salungo – Tagalog" lang="tl" hreflang="tl" data-title="Salungo" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%82%E0%AE%B0%E0%AF%88" title="மூரை – Tamil" lang="ta" hreflang="ta" data-title="மூரை" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Ade%C9%A3mus" title="Adeɣmus – Kabyle" lang="kab" hreflang="kab" data-title="Adeɣmus" data-language-autonym="Taqbaylit" data-language-local-name="Kabyle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A1%E0%B9%88%E0%B8%99%E0%B8%97%E0%B8%B0%E0%B9%80%E0%B8%A5" title="เม่นทะเล – Thai" lang="th" hreflang="th" data-title="เม่นทะเล" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-chr mw-list-item"><a href="https://chr.wikipedia.org/wiki/%E1%8E%A0%E1%8E%BA%E1%8F%89_%E1%8E%A1%E1%8E%AF_%E1%8F%A7%E1%8F%9F%E1%8F%B2%E1%8F%8D%E1%8F%97" title="ᎠᎺᏉ ᎡᎯ ᏧᏟᏲᏍᏗ – Cherokee" lang="chr" hreflang="chr" data-title="ᎠᎺᏉ ᎡᎯ ᏧᏟᏲᏍᏗ" data-language-autonym="ᏣᎳᎩ" data-language-local-name="Cherokee" class="interlanguage-link-target"><span>ᏣᎳᎩ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Denizkestanesi" title="Denizkestanesi – Turkish" lang="tr" hreflang="tr" data-title="Denizkestanesi" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tk mw-list-item"><a href="https://tk.wikipedia.org/wiki/De%C5%88iz_Kirpisi" title="Deňiz Kirpisi – Turkmen" lang="tk" hreflang="tk" data-title="Deňiz Kirpisi" data-language-autonym="Türkmençe" data-language-local-name="Turkmen" class="interlanguage-link-target"><span>Türkmençe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9C%D0%BE%D1%80%D1%81%D1%8C%D0%BA%D1%96_%D1%97%D0%B6%D0%B0%D0%BA%D0%B8" title="Морські їжаки – Ukrainian" lang="uk" hreflang="uk" data-title="Морські їжаки" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/C%E1%BA%A7u_gai" title="Cầu gai – Vietnamese" lang="vi" hreflang="vi" data-title="Cầu gai" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vls mw-list-item"><a href="https://vls.wikipedia.org/wiki/Z%C3%AAe-egels" title="Zêe-egels – West Flemish" lang="vls" hreflang="vls" data-title="Zêe-egels" data-language-autonym="West-Vlams" data-language-local-name="West Flemish" class="interlanguage-link-target"><span>West-Vlams</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Echinoidea" title="Echinoidea – Waray" lang="war" hreflang="war" data-title="Echinoidea" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%B5%B7%E8%83%86" title="海胆 – Wu" lang="wuu" hreflang="wuu" data-title="海胆" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%B5%B7%E8%86%BD" title="海膽 – Cantonese" lang="yue" hreflang="yue" data-title="海膽" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%B5%B7%E8%86%BD" title="海膽 – Chinese" lang="zh" hreflang="zh" data-title="海膽" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</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/Q83483#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Change 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/Sea_urchin" title="View the content page [c]" accesskey="c"><span>Page</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Talk:Sea_urchin&action=edit&redlink=1" rel="discussion" class="new" title="Discussion about the content page (not yet started) [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/Sea_urchin"><span>Read</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Sea_urchin&veaction=edit" title="Edit this page [v]" accesskey="v"><span>Change</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Sea_urchin&action=edit" title="Edit the source code of this page [e]" accesskey="e"><span>Change source</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Sea_urchin&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/Sea_urchin"><span>Read</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Sea_urchin&veaction=edit" title="Edit this page [v]" accesskey="v"><span>Change</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Sea_urchin&action=edit" title="Edit the source code of this page [e]" accesskey="e"><span>Change source</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Sea_urchin&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/Sea_urchin" title="A list of all wiki pages that link here [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Sea_urchin" rel="nofollow" title="New 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="//commons.wikimedia.org/wiki/Special:UploadWizard" 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=Sea_urchin&oldid=9521397" 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=Sea_urchin&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=Sea_urchin&id=9521397&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:UrlQ%C4%B1sald%C4%B1c%C4%B1s%C4%B1&url=https%3A%2F%2Fsimple.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSea_urchin%26oldid%3D9521397"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrKodu&url=https%3A%2F%2Fsimple.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSea_urchin%26oldid%3D9521397"><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-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Special:Book&bookcmd=book_creator&referer=Sea+urchin"><span>Make a book</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Sea_urchin&action=show-download-screen"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Sea_urchin&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Page for printing</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 class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Sea_urchin" hreflang="en"><span>Wikimedia Commons</span></a></li><li class="wb-otherproject-link wb-otherproject-species mw-list-item"><a href="https://species.wikimedia.org/wiki/Echinoidea" hreflang="en"><span>Wikispecies</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q83483" title="Link to connected data repository item [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 Simple English Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><div class="cdx-message cdx-message--block cdx-message--warning mw-revision"><span class="cdx-message__icon"></span><div class="cdx-message__content"><div id="mw-revision-info">Revision as of 11:35, 3 May 2024 by <a href="/wiki/User:Davey2010" class="mw-userlink" title="User:Davey2010" data-mw-revid="9521397"><bdi>Davey2010</bdi></a> <span class="mw-usertoollinks">(<a href="/wiki/User_talk:Davey2010" class="mw-usertoollinks-talk" title="User talk:Davey2010">talk</a> | <a href="/wiki/Special:Contributions/Davey2010" class="mw-usertoollinks-contribs" title="Special:Contributions/Davey2010">changes</a>)</span> <span class="comment">(Reverted 1 edit by <a href="/wiki/Special:Contributions/5.150.96.208" title="Special:Contributions/5.150.96.208">5.150.96.208</a> (<a href="/wiki/User_talk:5.150.96.208" title="User talk:5.150.96.208">talk</a>) identified as <a href="/wiki/Wikipedia:VAND" class="mw-redirect" title="Wikipedia:VAND">vandalism</a> to last revision by 171.33.196.3. (<a href="/wiki/Wikipedia:TW" class="mw-redirect" title="Wikipedia:TW">TW</a>))</span></div><div id="mw-revision-nav">(<a href="/w/index.php?title=Sea_urchin&diff=prev&oldid=9521397" title="Sea urchin">diff</a>) <a href="/w/index.php?title=Sea_urchin&direction=prev&oldid=9521397" title="Sea urchin">← Older revision</a> | Latest revision (diff) | Newer revision → (diff)</div></div></div></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> <table class="infobox biota" style="text-align: left; width: 200px; font-size: 100%"> <tbody><tr> <th colspan="2" style="text-align: center; background-color: rgb(235,235,210)">Sea urchin </th></tr> <tr> <td colspan="2" style="text-align: center"><span typeof="mw:File"><a href="/wiki/File:SeaUrchin.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/230px-SeaUrchin.jpg" decoding="async" width="230" height="307" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/345px-SeaUrchin.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/460px-SeaUrchin.jpg 2x" data-file-width="1704" data-file-height="2272" /></a></span> </td></tr> <tr> <th colspan="2" style="min-width:15em; text-align: center; background-color: rgb(235,235,210)"><a href="/wiki/Taxonomy_(biology)" class="mw-redirect" title="Taxonomy (biology)">Scientific classification</a> </th></tr> <tr> <td>Kingdom: </td> <td><div style="display:inline" class="kingdom"><a href="/wiki/Animal" title="Animal">Animalia</a></div> </td></tr> <tr> <td>Phylum: </td> <td><div style="display:inline" class="phylum"><a href="/wiki/Echinodermata" class="mw-redirect" title="Echinodermata">Echinodermata</a></div> </td></tr> <tr> <td>Subphylum: </td> <td><div style="display:inline" class="subphylum"><a href="/w/index.php?title=Echinozoa&action=edit&redlink=1" class="new" title="Echinozoa (not yet started)">Echinozoa</a></div> </td></tr> <tr> <td>Class: </td> <td><div style="display:inline" class="class"><b>Echinoidea</b></div> </td></tr> </tbody></table> <p><b>Sea urchins</b> are spiky members of the <a href="/wiki/Class_(biology)" title="Class (biology)">class</a> <b>Echinoidea</b> of the <a href="/wiki/Phylum" title="Phylum">phylum</a> <a href="/wiki/Echinodermata" class="mw-redirect" title="Echinodermata">Echinodermata</a>. Like the rest of the echinoderms, they are entirely <a href="/wiki/Ocean" title="Ocean">marine</a>. They are globe-shaped, and protected by <a href="/wiki/Calcareous" class="mw-redirect" title="Calcareous">calcareous</a> plates and spines. </p><p><i>Urchin</i> is an old word for <a href="/wiki/Hedgehog" title="Hedgehog">hedgehog</a>, and in many foreign languages these animals are called sea hedgehogs. </p><p>Like other echinoderms they have five-fold <a href="/wiki/Symmetry" title="Symmetry">symmetry</a> (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive 'tube feet'. The symmetry is not obvious in the living animal, but is easily visible in the dried test. </p><p>Sea urchins mostly feed on <a href="/wiki/Algae" title="Algae">algae</a> and small animals. They have a special chewing apparatus called <i><a href="/w/index.php?title=Aristotle%27s_lantern&action=edit&redlink=1" class="new" title="Aristotle's lantern (not yet started)">Aristotle's lantern</a></i>, after the <a href="/wiki/Ancient_Greece" title="Ancient Greece">Greek</a> <a href="/wiki/Philosopher" class="mw-redirect" title="Philosopher">philosopher</a> <a href="/wiki/Aristotle" title="Aristotle">Aristotle</a> who was fascinated by sea urchins. With this apparatus they can scrape organisms stuck to the surface over which the urchin is moving. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Spines">Spines</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sea_urchin&veaction=edit&section=1" title="Change section: Spines" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=1" title="Edit section's source code: Spines"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The spines are long and sharp in some species,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and protect the urchin from <a href="/wiki/Predator" class="mw-redirect" title="Predator">predators</a>. The spines inflict a painful wound when they penetrate human skin, but are usually not dangerous. Echinoids also have pincer-like pedicellaria all over their body between the spines. The job of these is to deal with anything (like larvae) settling on the test (outer shell).<sup id="cite_ref-Nichols_2-0" class="reference"><a href="#cite_note-Nichols-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup>p101</sup> It is not known if the spines are venomous unlike the pedicellariae between the spines, which are VENOMOUS. <sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Typical sea urchins have spines that are 1 to 3 centimetres (0.39 to 1.18 in) in length, 1 to 2 millimetres (0.039 to 0.079 in) thick, and not terribly sharp. <i>Diadema antillarum</i>, familiar in the Caribbean, has thin, potentially dangerous spines that can reach 10 to 30 centimetres (3.9 to 11.8 in) long. </p> <div class="mw-heading mw-heading2"><h2 id="Teeth">Teeth</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sea_urchin&veaction=edit&section=2" title="Change section: Teeth" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=2" title="Edit section's source code: Teeth"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sea urchins have five <a href="/wiki/Jaws" class="mw-redirect" title="Jaws">jaws</a> with one <a href="/wiki/Tooth" title="Tooth">tooth</a> each. The teeth grow throughout the sea urchin's life. The teeth of the pink sea urchin chip against each other to stay sharp.<sup id="cite_ref-PinkTeeth_4-0" class="reference"><a href="#cite_note-PinkTeeth-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Espinosa_5-0" class="reference"><a href="#cite_note-Espinosa-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Ecology">Ecology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sea_urchin&veaction=edit&section=3" title="Change section: Ecology" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=3" title="Edit section's source code: Ecology"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:SeaDSC01286.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/SeaDSC01286.JPG/230px-SeaDSC01286.JPG" decoding="async" width="230" height="173" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/SeaDSC01286.JPG/345px-SeaDSC01286.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7e/SeaDSC01286.JPG/460px-SeaDSC01286.JPG 2x" data-file-width="1632" data-file-height="1224" /></a><figcaption><i>Echinothrix calamaris</i>, a sea urchin with huge banded spines. The sphere, top, middle, is its anus.</figcaption></figure> <p>Sea urchins feed mainly on <a href="/wiki/Algae" title="Algae">algae</a>, but can also feed on sea cucumbers, and a wide range of <a href="/wiki/Invertebrate" title="Invertebrate">invertebrates</a> such as <a href="/wiki/Mussel" title="Mussel">mussels</a>, <a href="/wiki/Polychaete" title="Polychaete">polychaetes</a>, <a href="/wiki/Sponge" class="mw-redirect" title="Sponge">sponges</a>, <a href="/wiki/Brittle_star" title="Brittle star">brittle stars</a> and <a href="/wiki/Crinoid" class="mw-redirect" title="Crinoid">crinoids</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Sea urchins are one of the favorite foods of <a href="/wiki/Sea_otter" title="Sea otter">sea otters</a> and wolf <a href="/wiki/Eel" title="Eel">eels</a>. Without predators to eat them, urchins breed in large numbers and eat almost all the nearby kelp, creating an <i><a href="/wiki/Urchin_barren" title="Urchin barren">urchin barren</a></i>, devoid of macroalgae and associated <a href="/wiki/Fauna" title="Fauna">fauna</a>.<sup id="cite_ref-NHMag_7-0" class="reference"><a href="#cite_note-NHMag-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Grant_8-0" class="reference"><a href="#cite_note-Grant-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Sea otters have re-entered <a href="/wiki/British_Columbia" title="British Columbia">British Columbia</a>, dramatically improving coastal ecosystem health by eating sea urchins.<sup id="cite_ref-dfo_9-0" class="reference"><a href="#cite_note-dfo-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Fossil_record_and_evolution">Fossil record and evolution</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sea_urchin&veaction=edit&section=4" title="Change section: Fossil record and evolution" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=4" title="Edit section's source code: Fossil record and evolution"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The first echinoid <a href="/wiki/Fossil" title="Fossil">fossils</a> are from the Lower <a href="/wiki/Ordovician" title="Ordovician">Ordovician</a> period. The earliest forms had flexible tests, with plates that could slide over each other. Echinoids were a relatively unimportant part of the <a href="/wiki/Biota" title="Biota">biota</a> in the <a href="/wiki/Palaeozoic" title="Palaeozoic">Palaeozoic</a>. Only one group survived the <a href="/wiki/P/Tr_extinction_event" class="mw-redirect" title="P/Tr extinction event">P/Tr extinction event</a> to form the basis of all later echinoids.<sup id="cite_ref-Clarkson_10-0" class="reference"><a href="#cite_note-Clarkson-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The group which survived into the Triassic, the Cidaroids, radiated into all other modern groups, which are known as the Euechinoids. </p><p>The break with perfect symmetry, which happened in the <a href="/wiki/Jurassic" title="Jurassic">Jurassic</a>, gave them definite front and back ends. This opened up new habitats, in particular, the <a href="/wiki/Burrow" title="Burrow">burrowing</a> habitat. <a href="/wiki/Sand_dollar" title="Sand dollar">Sand dollars</a> and <a href="/wiki/Heart_urchin" title="Heart urchin">heart urchins</a> have been highly successful.<sup id="cite_ref-Nichols_2-1" class="reference"><a href="#cite_note-Nichols-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The living echinoids are now important members of the biota, especially in shallow and in-shore waters. </p> <div class="mw-heading mw-heading2"><h2 id="Sea_urchins_as_food">Sea urchins as food</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sea_urchin&veaction=edit&section=5" title="Change section: Sea urchins as food" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=5" title="Edit section's source code: Sea urchins as food"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some humans eat the reproductive organs of sea urchins (which they call <a href="/wiki/Roe" title="Roe">roe</a>). This is popular in <a href="/wiki/Korea" title="Korea">Korea</a>. In <a href="/wiki/Japan" title="Japan">Japan</a>, this kind of <a href="/wiki/Sushi" title="Sushi">sushi</a> is called <i>uni</i>. </p> <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=Sea_urchin&veaction=edit&section=6" title="Change section: References" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sea_urchin&action=edit&section=6" title="Edit section's source code: References"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Seeigel-Saugfuesse(Galicien2005).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Seeigel-Saugfuesse%28Galicien2005%29.jpg/200px-Seeigel-Saugfuesse%28Galicien2005%29.jpg" decoding="async" width="200" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Seeigel-Saugfuesse%28Galicien2005%29.jpg/300px-Seeigel-Saugfuesse%28Galicien2005%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/79/Seeigel-Saugfuesse%28Galicien2005%29.jpg/400px-Seeigel-Saugfuesse%28Galicien2005%29.jpg 2x" data-file-width="616" data-file-height="616" /></a><figcaption>Tube feet in action: how a sea urchin moves</figcaption></figure> <style data-mw-deduplicate="TemplateStyles:r9724317">.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"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">Rubber slippers will protect feet</span> </li> <li id="cite_note-Nichols-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Nichols_2-0">2.0</a></sup> <sup><a href="#cite_ref-Nichols_2-1">2.1</a></sup></span> <span class="reference-text">Nichols D. 1962. <i>Echinoderms</i>. Hutchinson, London. <style data-mw-deduplicate="TemplateStyles:r9724332">.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><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-09-065994-5" title="Special:BookSources/0-09-065994-5">0-09-065994-5</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite id="CITEREFSlaughter_RJ,_Beasley_DM,_Lambie_BS,_Schep_LJ2009" class="citation journal cs1">Slaughter RJ, Beasley DM, Lambie BS, Schep LJ (2009). "New Zealand's venomous creatures". <i>N.Z. Med. J</i>. <b>122</b> (1290): 83–97. <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/19319171">19319171</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=N.Z.+Med.+J.&rft.atitle=New+Zealand%27s+venomous+creatures&rft.volume=122&rft.issue=1290&rft.pages=83-97&rft.date=2009&rft_id=info%3Apmid%2F19319171&rft.au=Slaughter+RJ%2C+Beasley+DM%2C+Lambie+BS%2C+Schep+LJ&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_journal" title="Template:Cite journal">cite journal</a>}}</code>: CS1 maint: multiple names: authors list (<a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">link</a>)</span></span> </li> <li id="cite_note-PinkTeeth-4"><span class="mw-cite-backlink"><a href="#cite_ref-PinkTeeth_4-0">↑</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite id="CITEREFCell_Press2019" class="citation news cs1">Cell Press (September 19, 2019). <a rel="nofollow" class="external text" href="https://phys.org/news/2019-09-pink-sea-urchins-teeth-sharpen.html">"These pink sea urchins have teeth that sharpen themselves"</a>. Phys.org<span class="reference-accessdate">. Retrieved <span class="nowrap">May 27,</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=These+pink+sea+urchins+have+teeth+that+sharpen+themselves&rft.date=2019-09-19&rft.au=Cell+Press&rft_id=https%3A%2F%2Fphys.org%2Fnews%2F2019-09-pink-sea-urchins-teeth-sharpen.html&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span></span> </li> <li id="cite_note-Espinosa-5"><span class="mw-cite-backlink"><a href="#cite_ref-Espinosa_5-0">↑</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite id="CITEREFHoratio_D._EspinosaAlireza_ZaheriHoang_NguyenDavid_Restrepo2019" class="citation journal cs1">Horatio D. Espinosa; Alireza Zaheri; Hoang Nguyen; David Restrepo; Matthew Daly; Michael Frank; Joanna McKittrick (September 18, 2019). <a rel="nofollow" class="external text" href="https://www.cell.com/matter/fulltext/S2590-2385(19)30173-0">"In situ Wear Study Reveals Role of Microstructure on Self-Sharpening Mechanism in Sea Urchin Teeth"</a>. <i>Matter</i>. <b>1</b> (5): 1246–1261. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.matt.2019.08.015">10.1016/j.matt.2019.08.015</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:203651036">203651036</a><span class="reference-accessdate">. Retrieved <span class="nowrap">May 27,</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Matter&rft.atitle=In+situ+Wear+Study+Reveals+Role+of+Microstructure+on+Self-Sharpening+Mechanism+in+Sea+Urchin+Teeth&rft.volume=1&rft.issue=5&rft.pages=1246-1261&rft.date=2019-09-18&rft_id=info%3Adoi%2F10.1016%2Fj.matt.2019.08.015&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A203651036%23id-name%3DS2CID&rft.au=Horatio+D.+Espinosa&rft.au=Alireza+Zaheri&rft.au=Hoang+Nguyen&rft.au=David+Restrepo&rft.au=Matthew+Daly&rft.au=Michael+Frank&rft.au=Joanna+McKittrick&rft_id=https%3A%2F%2Fwww.cell.com%2Fmatter%2Ffulltext%2FS2590-2385%2819%2930173-0&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text">Baumiller T.K. 2008. Crinoid ecological morphology. <i>Annual Review of Earth and Planetary Sciences</i> <b>36</b>: 221–249. doi:10.1146/annurev.earth.36.031207.124116.</span> </li> <li id="cite_note-NHMag-7"><span class="mw-cite-backlink"><a href="#cite_ref-NHMag_7-0">↑</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite id="CITEREFDoug_Simpson2017" class="citation magazine cs1">Doug Simpson (February 2017). <a rel="nofollow" class="external text" href="https://naturalhistorymag.com/features/153361/underwater-barrens">"Underwater Barrens: Monitoring the fate of Southern Californian kelp requires a long view"</a>. Natural History Magazine<span class="reference-accessdate">. Retrieved <span class="nowrap">May 22,</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Underwater+Barrens%3A+Monitoring+the+fate+of+Southern+Californian+kelp+requires+a+long+view.&rft.date=2017-02&rft.au=Doug+Simpson&rft_id=https%3A%2F%2Fnaturalhistorymag.com%2Ffeatures%2F153361%2Funderwater-barrens&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_magazine" title="Template:Cite magazine">cite magazine</a>}}</code>: </span><span class="cs1-visible-error citation-comment">Cite magazine requires <code class="cs1-code">|magazine=</code> (<a href="/wiki/Help:CS1_errors#missing_periodical" title="Help:CS1 errors">help</a>)</span></span> </li> <li id="cite_note-Grant-8"><span class="mw-cite-backlink"><a href="#cite_ref-Grant_8-0">↑</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20200929135054/https://caseagrant.ucsd.edu/news/with-otters-away-what-keeps-urchins-at-bay">"With otters away, what keeps urchins at bay?"</a>. California Sea Grant. March 14, 2019. Archived from <a rel="nofollow" class="external text" href="https://caseagrant.ucsd.edu/news/with-otters-away-what-keeps-urchins-at-bay">the original</a> on September 29, 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">May 22,</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=With+otters+away%2C+what+keeps+urchins+at+bay%3F&rft.pub=California+Sea+Grant&rft.date=2019-03-14&rft_id=https%3A%2F%2Fcaseagrant.ucsd.edu%2Fnews%2Fwith-otters-away-what-keeps-urchins-at-bay&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span></span> </li> <li id="cite_note-dfo-9"><span class="mw-cite-backlink"><a href="#cite_ref-dfo_9-0">↑</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080123224702/http://www.dfo-mpo.gc.ca/species-especes/species/species_seaOtter_e.asp">"Aquatic Species at Risk - Species Profile - Sea Otter"</a>. Fisheries and Oceans Canada. Archived from <a rel="nofollow" class="external text" href="http://www.dfo-mpo.gc.ca/species-especes/species/species_seaOtter_e.asp">the original</a> on January 23, 2008<span class="reference-accessdate">. Retrieved <span class="nowrap">November 29,</span> 2007</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Aquatic+Species+at+Risk+-+Species+Profile+-+Sea+Otter&rft.pub=Fisheries+and+Oceans+Canada&rft_id=http%3A%2F%2Fwww.dfo-mpo.gc.ca%2Fspecies-especes%2Fspecies%2Fspecies_seaOtter_e.asp&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASea+urchin" class="Z3988"></span></span> </li> <li id="cite_note-Clarkson-10"><span class="mw-cite-backlink"><a href="#cite_ref-Clarkson_10-0">↑</a></span> <span class="reference-text">Clarkson E.N.K. 1998. <i>Invertebrate palaeontology and evolution</i>. 4th ed, Blackwell, Oxford. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9724332"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-412-47990-7" title="Special:BookSources/0-412-47990-7">0-412-47990-7</a>. (Chapter 9 covers Echinoderms).</span> </li> </ol></div></div> <div class="navbox-styles nomobile"><style data-mw-deduplicate="TemplateStyles:r9122492">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}</style></div><div role="navigation" class="navbox" aria-labelledby="Meat" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><style data-mw-deduplicate="TemplateStyles:r9122447">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Meat" title="Template:Meat"><abbr title="View this template" style=";;background:none transparent;border:none;box-shadow:none;padding:0;">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Meat" title="Template talk:Meat"><abbr title="Discuss this template" style=";;background:none transparent;border:none;box-shadow:none;padding:0;">t</abbr></a></li><li class="nv-edit"><a class="external text" href="https://simple.wikipedia.org/w/index.php?title=Template:Meat&action=edit"><abbr title="Edit this template" style=";;background:none transparent;border:none;box-shadow:none;padding:0;">e</abbr></a></li></ul></div><div id="Meat" style="font-size:114%;margin:0 4em"><a href="/wiki/Meat" title="Meat">Meat</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div id="*_Main_articles:_Fish_*_Game_*_Insects_*_Livestock_*_Meat_*_Poultry_*_Seafood"> <ul><li>Main articles: <a href="/wiki/Fish_as_food" title="Fish as food">Fish</a></li> <li><a href="/wiki/Game_(hunting)" title="Game (hunting)">Game</a></li> <li><a href="/wiki/Insects" class="mw-redirect" title="Insects">Insects</a></li> <li><a href="/wiki/Livestock" title="Livestock">Livestock</a></li> <li><a href="/wiki/Meat" title="Meat">Meat</a></li> <li><a href="/wiki/Poultry" title="Poultry">Poultry</a></li> <li><a href="/wiki/Seafood" title="Seafood">Seafood</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Poultry</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cassowary#Relationship_with_humans" title="Cassowary">Cassowary</a></li> <li><a href="/wiki/Chicken_as_food" title="Chicken as food">Chicken</a></li> <li><a href="/wiki/Duck" title="Duck">Duck</a></li> <li><a href="/wiki/Emu#Relationship_with_humans" title="Emu">Emu</a></li> <li><a href="/wiki/Goose" title="Goose">Goose</a></li> <li><a href="/wiki/Grouse" title="Grouse">Grouse</a></li> <li><a href="/wiki/Ostrich" title="Ostrich">Ostrich</a></li> <li><a href="/wiki/Partridge" title="Partridge">Partridge</a></li> <li><a href="/wiki/Pheasant" title="Pheasant">Pheasant</a></li> <li><a href="/wiki/Pigeon" class="mw-redirect" title="Pigeon">Pigeon</a></li> <li><a href="/wiki/Quails_as_food" class="mw-redirect" title="Quails as food">Quail</a></li> <li><a href="/wiki/Rhea_(bird)#Human_interaction" title="Rhea (bird)">Rhea</a></li> <li><a href="/wiki/Turkey" title="Turkey">Turkey</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:FoodMeat.jpg" class="mw-file-description" title="Food meat"><img alt="Food meat" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/FoodMeat.jpg/100px-FoodMeat.jpg" decoding="async" width="100" height="66" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/FoodMeat.jpg/150px-FoodMeat.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/FoodMeat.jpg/200px-FoodMeat.jpg 2x" data-file-width="2888" data-file-height="1916" /></a></span><br /><span typeof="mw:File"><a href="/wiki/File:Plateau_van_zeevruchten.jpg" class="mw-file-description" title="Platter of seafood"><img alt="Platter of seafood" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Plateau_van_zeevruchten.jpg/100px-Plateau_van_zeevruchten.jpg" decoding="async" width="100" height="100" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Plateau_van_zeevruchten.jpg/150px-Plateau_van_zeevruchten.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Plateau_van_zeevruchten.jpg/200px-Plateau_van_zeevruchten.jpg 2x" data-file-width="2029" data-file-height="2029" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Livestock</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alpaca" title="Alpaca">Alpaca</a></li> <li><a href="/wiki/Beef" title="Beef">Beef</a></li> <li><a href="/wiki/Beefalo" title="Beefalo">Beefalo</a></li> <li><a href="/wiki/American_bison#As_livestock" title="American bison">Bison</a></li> <li><a href="/wiki/Water_buffalo" title="Water buffalo">Buffalo</a></li> <li><a href="/wiki/Camel#Meat" title="Camel">Camel</a></li> <li><a href="/wiki/Cat" title="Cat">Cat</a></li> <li><a href="/wiki/Goat_meat" class="mw-redirect" title="Goat meat">Chevon (goat meat)</a></li> <li><a href="/wiki/Dog" title="Dog">Dog</a></li> <li><a href="/wiki/Elephant" title="Elephant">Elephant</a></li> <li><a href="/wiki/Escargot" class="mw-redirect" title="Escargot">Escargot</a></li> <li><a href="/wiki/Frog" title="Frog">Frog</a></li> <li><a href="/wiki/Guinea_pig#As_food" title="Guinea pig">Guinea pig</a> <ul><li><a href="/wiki/Guinea_pig#As_food" title="Guinea pig">Cuy</a></li></ul></li> <li><a href="/wiki/Horse" title="Horse">Horse</a></li> <li><a href="/wiki/Lamb_and_mutton" class="mw-redirect" title="Lamb and mutton">Lamb and mutton</a></li> <li><a href="/wiki/Llama" title="Llama">Llama</a></li> <li><a href="/wiki/Pork" title="Pork">Pork</a></li> <li><a href="/wiki/Veal" title="Veal">Veal</a></li> <li><a href="/wiki/Domestic_yak" title="Domestic yak">Yak</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Game</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alligator" title="Alligator">Alligator</a></li> <li><a href="/wiki/Bat" title="Bat">Bat</a></li> <li><a href="/wiki/Bear" title="Bear">Bear</a></li> <li><a href="/wiki/Wild_boar#As_a_game_animal_and_food_source" title="Wild boar">Boar</a></li> <li><a href="/wiki/Crocodile" title="Crocodile">Crocodile</a></li> <li><a href="/wiki/Kangaroo" title="Kangaroo">Kangaroo</a></li> <li><a href="/wiki/Monkey" title="Monkey">Monkey</a></li> <li><a href="/wiki/Pangolin_trade#Meat" class="mw-redirect" title="Pangolin trade">Pangolin</a></li> <li><a href="/wiki/Rat_meat" class="mw-redirect" title="Rat meat">Rat</a></li> <li><a href="/wiki/Hare#As_food" title="Hare">Hare</a> and <a href="/wiki/Rabbit#As_food_and_clothing" title="Rabbit">rabbit</a></li> <li><a href="/wiki/Snake#Consumption" title="Snake">Snake</a></li> <li><a href="/wiki/Turtle#As_food,_traditional_medicine,_and_cosmetics" title="Turtle">Turtle</a></li> <li><a href="/wiki/Venison" title="Venison">Venison</a></li> <li><a href="/wiki/Wolf" title="Wolf">Wolf</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Fish</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anchovy" title="Anchovy">Anchovy</a></li> <li><a href="/wiki/Bass_(fish)" title="Bass (fish)">Bass</a></li> <li><a href="/wiki/Carp" title="Carp">Carp</a></li> <li><a href="/wiki/Catfish" title="Catfish">Catfish</a></li> <li><a href="/wiki/Cod" title="Cod">Cod</a></li> <li><a href="/wiki/Crappie" title="Crappie">Crappie</a></li> <li><a href="/wiki/Eel" title="Eel">Eel</a></li> <li><a href="/wiki/Flounder" title="Flounder">Flounder</a></li> <li><a href="/wiki/Grouper" title="Grouper">Grouper</a></li> <li><a href="/wiki/Haddock" title="Haddock">Haddock</a></li> <li><a href="/wiki/Halibut" title="Halibut">Halibut</a></li> <li><a href="/wiki/Herring" title="Herring">Herring</a></li> <li><a href="/wiki/Mackerel" title="Mackerel">Mackerel</a></li> <li><a href="/wiki/Marlin" title="Marlin">Marlin</a></li> <li><a href="/wiki/Milkfish" title="Milkfish">Milkfish</a></li> <li><a href="/wiki/Perch" title="Perch">Perch</a></li> <li><a href="/wiki/Esox" title="Esox">Pike</a></li> <li><a href="/wiki/Pollock" title="Pollock">Pollock</a></li> <li><a href="/wiki/Salmon" title="Salmon">Salmon</a></li> <li><a href="/wiki/Sardine" title="Sardine">Sardine</a></li> <li><a href="/wiki/Shark" title="Shark">Shark</a></li> <li><a href="/wiki/Sole_(fish)" title="Sole (fish)">Sole</a></li> <li><a href="/wiki/Iridescent_shark" title="Iridescent shark">Swai</a></li> <li><a href="/wiki/Swordfish" title="Swordfish">Swordfish</a></li> <li><a href="/wiki/Tilapia" title="Tilapia">Tilapia</a></li> <li><a href="/wiki/Trout" title="Trout">Trout</a></li> <li><a href="/wiki/Tuna" title="Tuna">Tuna</a></li> <li><a href="/wiki/Walleye" title="Walleye">Walleye</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Shellfish and<br />other seafood</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abalone" title="Abalone">Abalone</a></li> <li><a href="/wiki/Calamari" title="Calamari">Calamari</a></li> <li><a href="/wiki/Clam" title="Clam">Clam</a></li> <li><a href="/wiki/Crab" title="Crab">Crab</a></li> <li><a href="/wiki/Crayfish" title="Crayfish">Crayfish</a></li> <li><a href="/wiki/Dolphin" title="Dolphin">Dolphin</a></li> <li><a href="/wiki/Lobster" title="Lobster">Lobster</a></li> <li><a href="/wiki/Mussel" title="Mussel">Mussel</a></li> <li><a href="/wiki/Octopus" title="Octopus">Octopus</a></li> <li><a href="/wiki/Oyster" title="Oyster">Oyster</a></li> <li><a href="/wiki/Scallop" title="Scallop">Scallop</a></li> <li><a href="/wiki/Pinniped" title="Pinniped">Seal</a></li> <li><a href="/wiki/Shrimp_and_prawn_as_food" class="mw-redirect" title="Shrimp and prawn as food">Shrimp/prawn</a></li> <li><a class="mw-selflink selflink">Sea urchin</a></li> <li><a href="/wiki/Whale" title="Whale">Whale</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Insects</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cicada#As_food_and_folk_medicine" title="Cicada">Cicada</a></li> <li><a href="/wiki/Cricket_(insect)#As_food" title="Cricket (insect)">Crickets</a></li> <li><a href="/wiki/Grasshopper#As_food" title="Grasshopper">Grasshoppers</a> (<a href="/wiki/Locust#As_food" title="Locust">locust</a>)</li> <li><a href="/wiki/Bombyx_mori#Cuisine" class="mw-redirect" title="Bombyx mori">Silkworm</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Cuts and<br />preparation</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bacon" title="Bacon">Bacon</a></li> <li><a href="/wiki/Barbecue" title="Barbecue">Barbecued</a></li> <li><a href="/wiki/Biltong" title="Biltong">Biltong</a></li> <li><a href="/wiki/Braising" title="Braising">Braised</a></li> <li><a href="/wiki/Hamburger" title="Hamburger">Burger</a></li> <li><a href="/wiki/Charcuterie" title="Charcuterie">Charcuterie</a></li> <li><a href="/wiki/Chop" class="mw-redirect" title="Chop">Chop</a></li> <li><a href="/wiki/Corned_beef" title="Corned beef">Corned</a></li> <li><a href="/wiki/Curing_(food_preservation)" title="Curing (food preservation)">Cured</a></li> <li><a href="/wiki/Frying" title="Frying">Fried</a></li> <li><a href="/wiki/Ground_meat" title="Ground meat">Ground</a></li> <li><a href="/wiki/Ham" title="Ham">Ham</a></li> <li><a href="/wiki/Kebab" title="Kebab">Kebab</a></li> <li><a href="/wiki/Liver_(food)" title="Liver (food)">Liver</a></li> <li><a href="/wiki/Marination" class="mw-redirect" title="Marination">Marinated</a></li> <li><a href="/wiki/Meatball" title="Meatball">Meatball</a></li> <li><a href="/wiki/Meatloaf" title="Meatloaf">Meatloaf</a></li> <li><a href="/wiki/Offal" title="Offal">Offal</a></li> <li><a href="/wiki/Pickling" title="Pickling">Pickled</a></li> <li><a href="/wiki/Roasting" title="Roasting">Roasted</a></li> <li><a href="/wiki/Sausage" title="Sausage">Sausage</a></li> <li><a href="/wiki/Steak" title="Steak">Steak</a></li> <li><a href="/wiki/Stew#Types_of_stew" title="Stew">Stewed</a></li> <li><a href="/wiki/Tandoor" title="Tandoor">Tandoor</a></li> <li><a href="/wiki/Steak_tartare" title="Steak tartare">Tartare</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">List articles</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_beef_dishes" class="mw-redirect" title="List of beef dishes">Beef dishes</a></li> <li><a href="/wiki/List_of_chicken_dishes" title="List of chicken dishes">Chicken dishes</a></li> <li><a href="/w/index.php?title=List_of_fish_dishes&action=edit&redlink=1" class="new" title="List of fish dishes (not yet started)">Fish dishes</a></li> <li><a href="/wiki/List_of_pork_dishes" class="mw-redirect" title="List of pork dishes">Pork dishes</a> <ul><li><a href="/w/index.php?title=List_of_ham_dishes&action=edit&redlink=1" class="new" title="List of ham dishes (not yet started)">Ham dishes</a></li></ul></li> <li><a href="/w/index.php?title=List_of_sausages&action=edit&redlink=1" class="new" title="List of sausages (not yet started)">Sausages</a></li> <li><a href="/w/index.php?title=List_of_seafood_dishes&action=edit&redlink=1" class="new" title="List of seafood dishes (not yet started)">Seafood dishes</a></li> <li><a href="/wiki/List_of_veal_dishes" class="mw-redirect" title="List of veal dishes">Veal dishes</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related<br />subjects</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Animal_rights" title="Animal rights">Animal rights</a></li> <li><a href="/wiki/Butcher" title="Butcher">Butcher</a></li> <li><a href="/wiki/Cannibalism" title="Cannibalism">Cannibalism</a></li> <li><a href="/wiki/Cultured_meat" title="Cultured meat">Cultured meat</a></li> <li><a href="/wiki/Entomophagy" title="Entomophagy">Entomophagy</a></li> <li><a href="/w/index.php?title=List_of_meat_dishes&action=edit&redlink=1" class="new" title="List of meat dishes (not yet started)">List of meat dishes</a></li> <li><a href="/wiki/Pescetarianism" title="Pescetarianism">Pescetarianism</a></li> <li><a href="/wiki/Food_preservation" title="Food preservation">Preservation</a></li> <li><a href="/wiki/Red_meat" class="mw-redirect" title="Red meat">Red meat</a></li> <li><a href="/wiki/Semi-vegetarianism" title="Semi-vegetarianism">Semi-vegetarianism</a> <ul><li><a href="/wiki/Slaughterhouse" title="Slaughterhouse">Slaughterhouse</a></li></ul></li> <li><a href="/wiki/Veganism" title="Veganism">Veganism</a></li> <li><a href="/wiki/Vegetarianism" title="Vegetarianism">Vegetarianism</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Meat" title="Category:Meat">Category: Meat</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://simple.wikipedia.org/w/index.php?title=Sea_urchin&oldid=9521397">https://simple.wikipedia.org/w/index.php?title=Sea_urchin&oldid=9521397</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Category</a>: <ul><li><a href="/wiki/Category:Echinoderms" title="Category:Echinoderms">Echinoderms</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:Pages_using_the_JsonConfig_extension" title="Category:Pages using the JsonConfig extension">Pages using the JsonConfig extension</a></li><li><a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">CS1 maint: multiple names: authors list</a></li><li><a href="/wiki/Category:CS1_errors:_missing_periodical" title="Category:CS1 errors: missing periodical">CS1 errors: missing periodical</a></li><li><a href="/wiki/Category:Articles_with_%27species%27_microformats" title="Category:Articles with 'species' microformats">Articles with 'species' microformats</a></li><li><a href="/wiki/Category:Taxobox_articles_missing_a_taxonbar" title="Category:Taxobox articles missing a taxonbar">Taxobox articles missing a taxonbar</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 changed on 3 May 2024, at 11:35.</li> <li id="footer-info-copyright">Text is available under the <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike License</a> and the <a href="/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License" title="Wikipedia:Text of the GNU Free Documentation License">GFDL</a>; additional terms may apply. See <a class="external text" href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use">Terms of Use</a> for details.</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-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/#/simple.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="//simple.m.wikipedia.org/w/index.php?title=Sea_urchin&oldid=9521397&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-66c5b56c76-4bbtk","wgBackendResponseTime":155,"wgPageParseReport":{"limitreport":{"cputime":"0.390","walltime":"0.743","ppvisitednodes":{"value":3762,"limit":1000000},"postexpandincludesize":{"value":41654,"limit":2097152},"templateargumentsize":{"value":2430,"limit":2097152},"expansiondepth":{"value":27,"limit":100},"expensivefunctioncount":{"value":1,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":32282,"limit":5000000},"entityaccesscount":{"value":1,"limit":400},"timingprofile":["100.00% 432.114 1 -total"," 41.36% 178.707 1 Template:Reflist"," 37.41% 161.657 1 Template:Taxobox"," 36.27% 156.744 1 Template:Taxobox/core"," 20.26% 87.553 14 Template:Taxobox_colour"," 15.55% 67.205 2 Template:ISBN"," 14.46% 62.494 2 Template:Cite_journal"," 13.51% 58.359 1 Template:Meat"," 12.84% 55.496 1 Template:Navbox"," 12.22% 52.804 14 Template:Delink"]},"scribunto":{"limitreport-timeusage":{"value":"0.159","limit":"10.000"},"limitreport-memusage":{"value":7129245,"limit":52428800}},"cachereport":{"origin":"mw-web.eqiad.main-565d46677b-2vvz9","timestamp":"20241128130134","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Sea urchin","url":"https:\/\/simple.wikipedia.org\/wiki\/Sea_urchin","sameAs":"http:\/\/www.wikidata.org\/entity\/Q83483","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q83483","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":"2006-08-06T12:21:30Z","dateModified":"2024-05-03T11:35:10Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/62\/SeaUrchin.jpg","headline":"class of marine invertebrates"}</script> </body> </html>