Echinometra lucunter (red rock urchin) (San Salvador Island, Bahamas)

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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: Echinometra lucunter (Linnaeus, 1758) - red rock urchin in rocky shoreline tidal pool. Sea urchins (regular echinoids) are starfish relatives with a pentaradially-symmetrical, subglobose, calcareous skeleton (test) covered in spines. The mouth is underneath the urchin, close to & at the water-substrate interface. Sea urchins are algae grazers - they use a pentaradially-structured jaw, called an Aristotle's lantern, to scrape algae and biofilms from hard substrates. The yellowish-colored organism near the lower left corner is Porites astreoides - the mustard hill coral. The whitish, semicircular structures surrounding the sea urchin are Padina jamaicensis - white scroll algae (Phaeophyta). Classification: Animalia, Echinodermata, Echinoidea, Echinometridae Locality: immediately east of “The Notch”, eastern part of southern margin of San Salvador Island, eastern Bahamas. Date: 23 March 2011, 14:36. Source: Echinometra lucunter (red rock urchin) (San Salvador Island, Bahamas). Author: James St. John.