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New diminutive camerate crinoids from the Ludlow of Oklahoma

Published online by Cambridge University Press:  01 May 2009

T. J. Frest  and
H. L. Strimple
T. J. Frest
Affiliation:
Department of Geology, The University of Iowa, Iowa City, Iowa 52242, U.S.A.
H. L. Strimple
Affiliation:
Department of Geology, The University of Iowa, Iowa City, Iowa 52242, U.S.A.
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Summary

Two new camerate crinoids from the Henryhouse (Ludlow) of Oklahoma are evolutionarily convergent on monocyclic inadunates. The prokopicrinid Nanicrinus (new) has a calyx consisting only of three basals (small basal in EA interrary) and five radials. The anal opening is bordered by two radials. Praedicticrinus (new) is a hirneacrinid with anal X as the sole interradial plate participating in the calyx and small basal located in DE interray. Assignment to the Camerata is based largely on presumed phylogenetic relationships. The similar-appearing Permian genera Plesiocrinus, Eutelecrinus, Metaeutelecrinus (new) and Paraeutelecrinus (new) are probable prokopicrinid homeomorphs derived from platycrinitid ancestors. They are assigned to the new family Eutelecrinidae. Adaptation of the definition of homeomorphy utilized by Chauff & Klapper (1978) is advocated for supposed paleontologic cases.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 3 , May 1980 , pp. 255 - 266
Copyright
Copyright © Cambridge University Press 1980

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