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ECB-ART-48177
Science 1969 Dec 19;1663912:1512-4. doi: 10.1126/science.166.3912.1512.
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Ctenocystoidea: new class of primitive echinoderms.

Robison RA , Sprinkle J .


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The oldest known "carpoids" of the echinoderm subphylum Homalozoa have been discovered in lower Middle Cambrian rocks of northern Utah. They were free-living benthonic animals characterized by a unique ctenoid feeding apparatus and flattened flexible theca with near bilateral symmetry. A new class, Ctenocystoidea, is proposed to include the new genus and new species, Ctenocystis utahensis.

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