Helicoplacoidea: A New Class of Echinoderms
- 17 May 1963
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 140 (3568) , 820-822
- https://doi.org/10.1126/science.140.3568.820
Abstract
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.This publication has 1 reference indexed in Scilit:
- LOWER CAMBRIAN-PRECAMBRIAN SUCCESSION, WHITE-INYO MOUNTAINS, CALIFORNIAGSA Bulletin, 1962