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Science 19 December 1969:
Vol. 166. no. 3912, pp. 1512 - 1514
DOI: 10.1126/science.166.3912.1512
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Articles

Ctenocystoidea: New Class of Primitive Echinoderms

Richard A. Robison 1 and James Sprinkle 2

1 Department of Geological and Geophysical Sciences, University of Utah, Salt Lake City 84112
2 Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts 02138

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Are homalozoans echinoderms? An answer from the extraxial-axial theory.
(2000)
Paleobiology 26, 529-555
Fossilized Viscera in Primitive Echinoderms.
B. N. Haugh, B. N. Haugh, and B. M. Bell (1980)
Science 209, 653-657
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Science. ISSN 0036-8075 (print), 1095-9203 (online)