Limulus polyphemus (Atlantic horseshoe crab) (Sanibel Island, Florida, USA) 2

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Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: English: Limulus polyphemus (Linnaeus, 1758) - Atlantic horseshoe crab in Florida, USA. (December 2013) This is the only living species of Limulus. Several fossil species have been reported from the Mesozoic and Cenozoic. Limulus horseshoe crabs are not true crabs, which are decapod crustaceans. Horseshoe crabs are xiphosuran chelicerates. The exoskeleton is tripartite, consisting of a semicircular cephalon (head), also called the prosoma, a subtriangular opisthosoma that is bordered by a series of spines, and a large posterior spine called a telson. Classification: Animalia, Arthropoda, Chelicerata, Merostomata, Xiphosura, Limulidae Locality: Lighthouse Beach, near Sanibel Lighthouse, eastern end of Sanibel Island, southwestern Florida, USA. Date: 14 December 2013, 16:01:57. Source: https://www.flickr.com/photos/jsjgeology/24522890902/. Author: James St. John. Camera location26° 27′ 15.95″ N, 82° 00′ 51.46″ W View all coordinates using: OpenStreetMap 26.454430; -82.014295.