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ECB-ART-48178
Science 1963 May 17;1403568:820-2. doi: 10.1126/science.140.3568.820.
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Helicoplacoidea: A New Class of Echinoderms.

Durham JW , Caster KE .


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A fusiform, spirally coiled and pleated, free-living, heavily placate echinoderm with an expansible test has been discovered in the Lower Cambrian Olenellus zone of California. It is characterized by 10 "interambulacral" areas, a single principal endothecal ambulacrum with a short branch, and oral and apical regions at opposite poles. A new class, the Helicoplacoidea is proposed for the new genus Helicoplacus, with two new species, H. gilberti (type species) and H. curtisi.

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