{"id":2172,"date":"2013-11-12T14:10:33","date_gmt":"2013-11-12T19:10:33","guid":{"rendered":"http:\/\/www.ordovicianatlas.org\/?page_id=2172"},"modified":"2016-09-11T17:39:04","modified_gmt":"2016-09-11T21:39:04","slug":"isotelus-gigas","status":"publish","type":"page","link":"https:\/\/www.ordovicianatlas.org\/atlas\/arthropoda\/trilobita\/asaphida\/asaphidae\/isotelus\/isotelus-gigas\/","title":{"rendered":"<em>Isotelus gigas<\/em>"},"content":{"rendered":"<div align=\"left\">\n<div style=\"height: 250px;\" align=\"center\">\n<div style=\"border-right: 20px solid white; float: left; width: 250px;\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2014\/07\/isotelus-gigas-250-white.png?w=605&#038;ssl=1\" alt=\"\" \/><\/div>\n<div style=\"float: left; width: 250px;\">\n<p align=\"left\"><strong>Classification<\/strong><br \/>\nPhylum: <a title=\"Arthropoda\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/Arthropoda\/\">Arthropoda<\/a><br \/>\nClass: <a title=\"Trilobita\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/Arthropoda\/trilobita\/\">Trilobita<\/a><br \/>\nOrder: <a title=\" Asaphida\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/Arthropoda\/trilobita\/asaphida\">Asaphida<\/a><br \/>\nFamily: <a title=\" Asaphidae\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/Arthropoda\/trilobita\/asaphida\/asaphidae\">Asaphidae<\/a><br \/>\nGenus: <a title=\"Isotelus\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/arthropoda\/trilobita\/asaphida\/asaphidae\/isotelus\/\">Isotelus<\/a><br \/>\nSpecies: <em>Isotelus gigas<\/em> (DeKay,1824)<\/p>\n<\/div>\n<div style=\"float: right; width: 250px;\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_paleoeco.png?w=605&#038;ssl=1\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<div style=\"clear: both;\">\n<p>[accordions title=&#8221;&#8221; disabled=&#8221;false&#8221; active=&#8221;1&#8243; autoheight=&#8221;false&#8221; collapsible=&#8221;true&#8221;] [accordion title=&#8221;Taxonomic Details&#8221;]<\/p>\n<p>[\/accordion] [\/accordions]<\/p>\n<\/div>\n<div class=\"grid col-300\">\n<p><strong>Stratigraphic Occurrences<\/strong><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_strat.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-3458\" src=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_strat.png?resize=300%2C273&#038;ssl=1\" alt=\"I.gigas_strat\" width=\"300\" height=\"273\" data-id=\"3458\" srcset=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_strat.png?resize=300%2C273&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_strat.png?resize=150%2C136&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2013\/12\/I.gigas_strat.png?w=724&amp;ssl=1 724w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<\/div>\n<div class=\"grid col-100\"><\/div>\n<div class=\"grid col-575 fit\">\n<p><strong>Geographic Occurrences<\/strong><\/p>\n<pre><code><div class=\"leaflet-map WPLeafletMap\" style=\"height:250px; width:575px;\"><\/div><script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMapShortcode() {\/*<script>*\/\nvar baseUrl = atob('Ly97c30udGlsZS5vcGVuc3RyZWV0bWFwLm9yZy97en0ve3h9L3t5fS5wbmc=');\nvar base = (!baseUrl && window.MQ) ?\n    window.MQ.mapLayer() : L.tileLayer(baseUrl,\n        L.Util.extend({}, {\n            detectRetina: 0,\n        },\n        {\"subdomains\":\"abc\",\"noWrap\":false,\"maxZoom\":13}        )\n    );\n    var options = L.Util.extend({}, {\n        layers: [base],\n        attributionControl: false\n    },\n    {\"zoomControl\":true,\"scrollWheelZoom\":false,\"doubleClickZoom\":false,\"fitBounds\":false,\"minZoom\":0,\"maxZoom\":13,\"maxBounds\":null,\"attribution\":\"<a href=\\\"http:\\\/\\\/leafletjs.com\\\" title=\\\"A JS library for interactive maps\\\">Leaflet<\\\/a>; \\r\\n\\u00a9 <a href=\\\"http:\\\/\\\/www.openstreetmap.org\\\/copyright\\\">OpenStreetMap<\\\/a> contributors\"},\n    {});\nwindow.WPLeafletMapPlugin.createMap(options).setView([39,-84.5],7);});<\/script><\/code><\/pre>\n<pre><code>Map point data provided by <a href=\"https:\/\/www.idigbio.org\/\">iDigBio.<\/a><\/code><\/pre>\n<\/div>\n<div style=\"clear: both;\">[accordions title=&#8221;&#8221; disabled=&#8221;false&#8221; active=&#8221;1&#8243; autoheight=&#8221;false&#8221; collapsible=&#8221;true&#8221;] [accordion title=&#8221;Stratigraphic Description&#8221;]<br \/>\nSequence (Formation)<\/p>\n<ul>\n<li>C5 Sequence (Whitewater, Liberty, Waynesville)<\/li>\n<li>C4 Sequence (Arnheim)<\/li>\n<li>C3 Sequence (Mt. Auburn, Corryville)<\/li>\n<li>C2 Sequence (Fairview)<\/li>\n<li>C1 Sequence (Clays Ferry\/Kope)<\/li>\n<\/ul>\n<p><strong>Notes:<\/strong><br \/>\n<em>Ross (1967)<\/em><\/p>\n<ul>\n<li>5 feet above base of the Salvisa Bed of the Lexington Limestone, 20 ft below base of Clays Ferry<br \/>\nGrier Limestone Member of the Lexington Limestone, 75-78 feet below base of Clays Ferry Formation<\/li>\n<\/ul>\n<\/div>\n<p>[\/accordion] [\/accordions]<\/p>\n<div>\n<p><strong>Identification in Hand Sample<\/strong><\/p>\n<div align=\"left\">\n<ul>\n<li>Pygidium is distinctly subtriangular.<\/li>\n<li>Cephalon similarly subtriangular.<\/li>\n<li>Lacks genal spines in all cases except for the smallest specimens.<\/li>\n<li>Can be distinguished from the much more common <em>I. maximus<\/em> by the lack of genal spines altogether, or the presence of shorter genal spines on small specimens.<\/li>\n<li>Pygidial and cephalic margins more triangular than <em>I. maximus<\/em>.<\/li>\n<\/ul>\n<\/div>\n<div align=\"center\">\n<div style=\"width: 800px;\">\n<div><a href=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2014\/07\/Isotelus-gigas-800.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/i0.wp.com\/www.ordovicianatlas.org\/wp-content\/uploads\/2014\/07\/Isotelus-gigas-800.png?resize=605%2C191&#038;ssl=1\" width=\"605\" height=\"191\" \/><\/a><\/div>\n<p style=\"margin-top: 0; font-size: 75%;\" align=\"left\"><em>Isotelus gigas<\/em> from Utica Group of New York (CMCIP 33070, left) and unknown location (CMCIP 0339)<\/p>\n<\/div>\n<\/div>\n<div style=\"clear: both;\">[accordions title=&#8221;&#8221; disabled=&#8221;false&#8221; active=&#8221;1&#8243; autoheight=&#8221;false&#8221; collapsible=&#8221;true&#8221;] [accordion title=&#8221;Published Description&#8221;]<br \/>\n<em>McFarlan<\/em> (1931):<\/p>\n<ul>\n<li>A large species commonly attaining a length of 200-250 mm., at times practically double the figure. Width somewhat over half the length. Axis forming about one-half the width. The most distinctive feature is the subtriangular form of the pygidium with length about 3\/4 width. Cephalon similarly subtriangular. Genal spines short, present only in the smaller specimens.<br \/>\nMohawkian and Cincinnatian.<\/li>\n<\/ul>\n<p><em>DeKay<\/em> (1824):<\/p>\n<ul>\n<li><em>Isotelus gigas<\/em>:<br \/>\nHead representing a spherical triangle, surface punctate, convex descending from between the eyes to the anterior border, which has a narrow raised rim: posterior extremity concave and corresponding to the articulation of the abdomen. Eyes elevated, prominent, sub-pedunculated; cornea oblong, lunated, highly polished. Abdomen with eight distinct articulations, the middle lobe double the size of the lateral one; these latter are continuous with the middle lobe, have a deep furrow impressed on their upper surfaces, which becomes gradually effaced towards their narrow free extremities. These lateral lobes are rounded. at their extremities, and flattened in such a manner as to allow each lobe to slide easily under the lobe immediately preceding. Tail subtriangular, convex, equaling the head in size, with the posterior termination rounded. On the centre of its surface, when accidentally decorated, a slight elevation may be traced, if the specimen be held in a certain light, which appears to be a continuation of the middle lobe; this extends to within short distance of the posterior angle of the tail, when it is either entirely laced, or terminates in an abrupt truncation. Another elevation runs parallel to, and at a short distance from the edge of the tail. These elevations are connected by obscure parallel lines, imitating the spaces between the lateral lobes. When the tail is fractured on the borders, a semi-lunar depression is visible, exhibiting concentric striz. The whole surface of the animal has a jet black polish.<br \/>\nTotal length, 6-12 English inches.<br \/>\nCabinet of the Lyceum.<\/li>\n<\/ul>\n<p>[\/accordion] [\/accordions]<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Classification Phylum: Arthropoda Class: Trilobita Order: Asaphida Family: Asaphidae Genus: Isotelus Species: Isotelus gigas (DeKay,1824) [accordions title=&#8221;&#8221; disabled=&#8221;false&#8221; active=&#8221;1&#8243; autoheight=&#8221;false&#8221; collapsible=&#8221;true&#8221;] [accordion title=&#8221;Taxonomic Details&#8221;] [\/accordion] [\/accordions] Stratigraphic Occurrences Geographic Occurrences Map point data provided by iDigBio. [accordions title=&#8221;&#8221; disabled=&#8221;false&#8221; active=&#8221;1&#8243; &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"more-link\" href=\"https:\/\/www.ordovicianatlas.org\/atlas\/arthropoda\/trilobita\/asaphida\/asaphidae\/isotelus\/isotelus-gigas\/\"> <span class=\"screen-reader-text\"><em>Isotelus gigas<\/em><\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2170,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"full-width-page.php","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-2172","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P3T22h-z2","_links":{"self":[{"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/pages\/2172","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/comments?post=2172"}],"version-history":[{"count":12,"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/pages\/2172\/revisions"}],"predecessor-version":[{"id":13703,"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/pages\/2172\/revisions\/13703"}],"up":[{"embeddable":true,"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/pages\/2170"}],"wp:attachment":[{"href":"https:\/\/www.ordovicianatlas.org\/wp-json\/wp\/v2\/media?parent=2172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}