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Journal Article

An Unusual New Asteriid (Echinodermata: Asteroidea) from the Cretaceous of California

Daniel B. Blake and Dallas O. Peterson
Journal of Paleontology
Vol. 67, No. 4 (Jul., 1993), pp. 586-589
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/1305932
Page Count: 4

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Topics: Arm, Paleontology, Geology, Sediments, Fossils, Biological taxonomies, Campanian age, Genera
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
An Unusual New Asteriid (Echinodermata: Asteroidea) from the Cretaceous of California
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Abstract

Pegaster stichos n. gen. and sp., from the Cretaceous Chico Formation of Northern California, is the first-known fossil representative of the hitherto monogeneric Neomorphasterinae (Asteroidea: Asteriidae). Pegaster is morphologically similar to living Neomorphaster, again demonstrating the conservative evolution noted elsewhere among asteroids. Pegaster probably lived in a shallow shelf environment subject to strong storm action whereas Neomorphaster is known only from considerably greater depths; Pegaster provides a new example of an asteroid taxon excluded from shallower habitats through time.

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