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Phylogenetic relationships of the Middle Ordovician trepostome bryozoans Sonninopora and Bimuropora

Published online by Cambridge University Press:  20 May 2016

Marcus M. Key Jr.  and
Andrew B. Judd
Marcus M. Key Jr.
Affiliation:
Department of Geology, Dickinson College, P.O. Box 1773, Carlisle, Pennsylvania 17013-2896
Andrew B. Judd
Affiliation:
Department of Geology, Dickinson College, P.O. Box 1773, Carlisle, Pennsylvania 17013-2896
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Abstract

Bimuropora dendroidea, previously assigned to other genera, is described from Tennessee and B. winchelli is reported from Nevada. The occurrence of B. winchelli in Nevada extends the geographic range of the Middle Ordovician trepostome genus Bimuropora in North America. These two species share many derived characteristics with the halloporids, including a similar growth pattern and fluted zooecial walls in the endozone. This strengthens the hypothesis that the bimuroporids are a sister group to the halloporids. Sonninopora, a monospecific genus, contains these same features, and because of the presence of acanthostyles it is removed from the family Halloporidae and assigned to the family Bimuroporidae.

Type
Research Article
Information
Journal of Paleontology , Volume 68 , Issue 2 , March 1994 , pp. 233 - 241
Copyright
Copyright © The Paleontological Society 

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