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A new, phylogenetically significant Early Ordovician asteroid (Echinodermata)

Published online by Cambridge University Press:  14 July 2015

Daniel B. Blake ,
Thomas E. Guensburg ,
James Sprinkle  and
Colin Sumrall
Daniel B. Blake
Affiliation:
Department of Geology, University of Illinois, Urbana 61801,
Thomas E. Guensburg
Affiliation:
Physical Sciences Division, Rock Valley College, Rockford, Illinois 61114,
James Sprinkle
Affiliation:
Department of Geological Sciences, University of Texas, Austin 78712,
Colin Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville 37996,
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Abstract

A new monospecific family of asteroids (Echinodermata) is based on Eukrinaster ibexensis n. gen. and sp. from the Lower Ordovician of Utah and Nevada. Eukrinaster, Arenig in age, is one of the earliest of known asterozoans. The new, relatively well-preserved fossils yield important information on character state distribution that will be useful for the interpretation of phylogenetic relationships among the three asterozoan classes, the Somasteroidea, Ophiufoidea, and Asteroidea. In addition, overall form is suggestive of certain living asteroids: to the extent that form equates with function, similarities suggest ecologic parallels in these only distantly related asteroids inhabiting ecologically distinct worlds.

Type
Research Article
Information
Journal of Paleontology , Volume 81 , Issue 6 , November 2007 , pp. 1257 - 1265
Copyright
Copyright © The Paleontological Society 

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