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<tbody><tr> <th colspan="2" style="color:inherit; text-align: center; background-color: rgb(235,235,210)">Planaterga<br /><div style="font-size: 85%;">Temporal range: <span class="noprint"><span style="display:inline-block;"></span><span style="display:inline-block;">Ordovician–Recent</span> <span style="display:inline-block;"></span><div id="Timeline-row" style="margin: 4px auto 0; clear:both; width:220px; padding:0px; height:18px; overflow:visible; white-space:nowrap; border:1px #666; border-style:solid none; position:relative; z-index:0; font-size:97%;"> <div style="position:absolute; height:100%; left:0px; width:207.23076923077px; padding-left:5px; text-align:left; background-color:rgb(254,217,106); background-image: linear-gradient(to right, rgba(255,255,255,1), rgba(254,217,106,1) 15%, rgba(254,217,106,1));"><a href="/wiki/Precambrian" title="Precambrian">PreꞒ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,160,86); left:37.636923076923px; width:18.073846153846px;"><a href="/wiki/Cambrian" title="Cambrian">Ꞓ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(0,146,112); left:55.710769230769px; width:14.08px;"><a href="/wiki/Ordovician" title="Ordovician">O</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(179,225,182); left:69.790769230769px; width:8.3261538461539px;"><a href="/wiki/Silurian" title="Silurian">S</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(203,140,55); left:78.116923076923px; width:20.409230769231px;"><a href="/wiki/Devonian" title="Devonian">D</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(103,165,153); left:98.526153846154px; width:20.307692307692px;"><a href="/wiki/Carboniferous" title="Carboniferous">C</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(240,64,40); left:118.83384615385px; width:15.907015384615px;"><a href="/wiki/Permian" title="Permian">P</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(129,43,146); left:134.74086153846px; width:17.092984615385px;"><a href="/wiki/Triassic" title="Triassic">T</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(52,178,201); left:151.83384615385px; width:19.089230769231px;"><a href="/wiki/Jurassic" title="Jurassic">J</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,198,78); left:170.92307692308px; width:26.738461538462px;"><a href="/wiki/Cretaceous" title="Cretaceous">K</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(253,154,82); left:197.66153846154px; width:14.543692307692px;"><a href="/wiki/Paleogene" title="Paleogene">Pg</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(255,230,25); left:212.20523076923px; width:6.9215384615385px;"><a href="/wiki/Neogene" title="Neogene">N</a></div> <div id="end-border" style="position:absolute; height:100%; background-color:#666; width:1px; left:219px"></div><div style="margin:0 auto; line-height:0; clear:both; width:220px; padding:0px; height:8px; overflow:visible; background-color:transparent; position:relative; top:-4px; z-index:100;"><div style="position:absolute; height:8px; left:49.076923076923px; width:170.92307692308px; background-color:#360; opacity:0.42;"></div> <div style="position:absolute; height:8px; left:55.710769230769px; width:164.28923076923px; background-color:#360; opacity:1;"></div> <div style="position:absolute; height:6px; top:1px; left:56.710769230769px; width:162.28923076923px; background-color:#6c3;"></div> </div> </div></span></div> </th></tr> <tr> <td colspan="2" style="text-align: center"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Limuloides_limuloides_specimen_In_60018.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Limuloides_limuloides_specimen_In_60018.jpg/220px-Limuloides_limuloides_specimen_In_60018.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Limuloides_limuloides_specimen_In_60018.jpg/330px-Limuloides_limuloides_specimen_In_60018.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/68/Limuloides_limuloides_specimen_In_60018.jpg/440px-Limuloides_limuloides_specimen_In_60018.jpg 2x" data-file-width="640" data-file-height="480" /></a></span> </td></tr> <tr> <td colspan="2" style="text-align: center; font-size: 88%">Fossil of <i><a href="/wiki/Limuloides" title="Limuloides">Limuloides limuloides</a></i>, a <a href="/wiki/Bunodidae" title="Bunodidae">bunodid</a> </td></tr> <tr> <td colspan="2" style="text-align: center"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Eatoniana_namaquensis_46890827.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Eatoniana_namaquensis_46890827.jpg/220px-Eatoniana_namaquensis_46890827.jpg" decoding="async" width="220" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Eatoniana_namaquensis_46890827.jpg/330px-Eatoniana_namaquensis_46890827.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Eatoniana_namaquensis_46890827.jpg/440px-Eatoniana_namaquensis_46890827.jpg 2x" data-file-width="2048" data-file-height="1634" /></a></span> </td></tr> <tr> <td colspan="2" style="text-align: center; font-size: 88%"><i><a href="/wiki/Eatoniana_namaquensis" class="mw-redirect" title="Eatoniana namaquensis">Eatoniana namaquensis</a></i>, a <a href="/wiki/Mite" title="Mite">mite</a> <a href="/wiki/Arachnid" title="Arachnid">arachnid</a> </td></tr> <tr> <th colspan="2" style="color:inherit; min-width:15em; text-align: center; background-color: rgb(235,235,210)"><a href="/wiki/Taxonomy_(biology)" title="Taxonomy (biology)">Scientific classification</a> <span class="plainlinks taxobox-edit-taxonomy skin-invert" style="font-size:smaller; float:right; padding-right:0.4em; margin-left:-3em;"><span typeof="mw:File"><a href="/wiki/Template:Taxonomy/Planaterga" title="Edit this classification"><img alt="Edit this classification" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr.svg/15px-OOjs_UI_icon_edit-ltr.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr.svg/23px-OOjs_UI_icon_edit-ltr.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr.svg/30px-OOjs_UI_icon_edit-ltr.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span> </th></tr> <tr> <td>Domain: </td> <td><a href="/wiki/Eukaryote" title="Eukaryote">Eukaryota</a> </td></tr> <tr> <td>Kingdom: </td> <td><a href="/wiki/Animal" title="Animal">Animalia</a> </td></tr> <tr> <td>Phylum: </td> <td><a href="/wiki/Arthropod" title="Arthropod">Arthropoda</a> </td></tr> <tr> <td>Subphylum: </td> <td><a href="/wiki/Chelicerata" title="Chelicerata">Chelicerata</a> </td></tr> <tr> <td><i>Clade</i>: </td> <td><a href="/wiki/Prosomapoda" title="Prosomapoda">Prosomapoda</a> </td></tr> <tr> <td><i>Clade</i>: </td> <td><a class="mw-selflink selflink">Planaterga</a><br /><small>Lamsdell, 2013</small> </td></tr> <tr> <th colspan="2" style="color:inherit; text-align: center; background-color: rgb(235,235,210)">Groups </th></tr> <tr> <td colspan="2" style="text-align: left"> <ul><li>†<i><a href="/wiki/Bembicosoma" title="Bembicosoma">Bembicosoma</a></i></li> <li>†?<i><a href="/wiki/Bunaia" title="Bunaia">Bunaia</a></i></li> <li>†<i><a href="/wiki/Pasternakevia" title="Pasternakevia">Pasternakevia</a></i></li> <li>†<a href="/wiki/Bunodidae" title="Bunodidae">Bunodidae</a></li> <li>†<a href="/wiki/Pseudoniscidae" title="Pseudoniscidae">Pseudoniscidae</a></li> <li><a href="/wiki/Dekatriata" title="Dekatriata">Dekatriata</a></li></ul> </td></tr> </tbody></table><style data-mw-deduplicate="TemplateStyles:r1238732961">@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox.biota tr{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .infobox.biota img{background:transparent}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox.biota tr{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .infobox.biota img{background:white}}.mw-parser-output .infobox.biota .taxobox-edit-taxonomy img{background:transparent!important}body.skin-vector .mw-parser-output table.biota.infobox{margin-top:0.5em}body.skin--responsive .mw-parser-output table.biota.infobox tr.taxonrow td{padding:2px 10px}</style> <p><b>Planaterga</b> is a <a href="/wiki/Clade" title="Clade">clade</a> of <a href="/wiki/Prosomapoda" title="Prosomapoda">prosomapod</a> <a href="/wiki/Chelicerate" class="mw-redirect" title="Chelicerate">euchelicerates</a> including several <a href="/wiki/Synziphosurina" title="Synziphosurina">synziphosurid</a> genera (mainly <a href="/wiki/Bunodidae" title="Bunodidae">bunodids</a> and <a href="/wiki/Pseudoniscidae" title="Pseudoniscidae">pseudoniscids</a>) and the group <a href="/wiki/Dekatriata" title="Dekatriata">Dekatriata</a> (which in turn includes <a href="/wiki/Arachnid" title="Arachnid">arachnids</a>, <a href="/wiki/Chasmataspidida" title="Chasmataspidida">chasmataspidids</a> and <a href="/wiki/Eurypterid" title="Eurypterid">eurypterids</a>).<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Planaterga is defined by the opisthosoma with tergites broadest at third or fourth and lacking enlarged axial nodes, carapace (prosomal dorsal shield) with reduced genal spines, as well as somite VII (first opisthosomal segment) with reduced appendages and microtergite.<sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </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=Planaterga&action=edit&section=1" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output 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cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFLamsdell2012" class="citation journal cs1">Lamsdell, James C. (2012-12-18). <a rel="nofollow" class="external text" href="https://doi.org/10.1111%2Fj.1096-3642.2012.00874.x">"Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura"</a>. <i>Zoological Journal of the Linnean Society</i>. <b>167</b> (1): 1–27. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1111%2Fj.1096-3642.2012.00874.x">10.1111/j.1096-3642.2012.00874.x</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0024-4082">0024-4082</a>.</cite><span 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