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Early Ordovician mitrates and a possible solute (Echinodermata) from the western United States

Published online by Cambridge University Press:  20 May 2016

Colin D. Sumrall ,
James Sprinkle ,
Thomas E. Guensburg  and
Benjamin F. Dattilo
Colin D. Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville 37996-1410, USA,
James Sprinkle
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas, Austin 78712-0254, USA,
Thomas E. Guensburg
Affiliation:
Physical Science Division, Rock Valley College, Rockford, Illinois 61114, USA,
Benjamin F. Dattilo
Affiliation:
Department of Geosciences, Indiana University–Purdue University Fort Wayne, Fort Wayne, Indiana 46805, USA,
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Abstract

Two new kirkocystid mitrate stylophorans (Echinodermata, Homalozoa) and a new possible solute (Echinodermata, Homalozoa) are described from the Early Ordovician of the western United States. The mitrates are among the earliest members of their clade to appear near the beginning of the Ordovician Radiation. Anatifopsis ninemilensis new species comes from the Ninemile Shale in central Nevada and the McKelligon Canyon Formation in west Texas. Anatifopsis fillmorensis new species comes from the middle Fillmore Formation in western Utah and a Ninemile Shale equivalent limestone bed in southern Nevada. The possible solute Drepanocystis dubius new genus new species from the lower Wah Wah Limestone in western Utah, shows unusual morphology with an elongate theca and a long arm shaped like a sickle.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 4 , July 2012 , pp. 595 - 604
Copyright
Copyright © The Paleontological Society 

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