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Science 17 May 1963:
Vol. 140. no. 3568, pp. 820 - 822
DOI: 10.1126/science.140.3568.820
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Articles

Helicoplacoidea: A New Class of Echinoderms

J. W. Durham 1 and K. E. Caster 2

1 University of California, Berkeley
2 University of Cincinnati, Cincinnati, Ohio

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 ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Taphonomy and Environmental Distribution of Helicoplacoid Echinoderms.
(2001)
Palaios 16, 197-204
Evolutionary paleoecology of the earliest echinoderms: Helicoplacoids and the Cambrian substrate revolution.
S. Q. Dornbos and D. J. Bottjer (2000)
Geology 28, 839-842
   Abstract »    Full Text »    PDF »
Fossilized Viscera in Primitive Echinoderms.
B. N. Haugh, B. N. Haugh, and B. M. Bell (1980)
Science 209, 653-657
   Abstract »    PDF »


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