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Middle Jurassic bryozoans from the Carmel Formation of southwestern Utah

Published online by Cambridge University Press:  14 July 2015

Paul D. Taylor  and
Mark A. Wilson
Paul D. Taylor
Affiliation:
Department of Palaeontology, The Natural History Museum, London SW7 5BD, England
Mark A. Wilson
Affiliation:
Department of Geology, The College of Wooster, Wooster, Ohio 44691
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Abstract

Very few Jurassic bryozoan faunas are known outside Europe. Here we describe seven species of calcareous cyclostome bryozoans and one bioimmured soft-bodied ctenostome bryozoan (Simplicidium sp.) from the Middle Jurassic (?Bathonian) Carmel Formation of Utah. Three of the cyclostomes are placed in open nomenclature due to inadequate preservation and/or the lack of key reproductive polymorphs. A new genus, Patulopora, is established for Diastopora cutleri Cuffey and Ehleiter, 1984, following the discovery of gonozooids that place this species in the Multisparsidae rather than in the Plagioeciidae. Another of Cuffey and Ehleiter's (1984) species—Berenicea duofluvina—is reassigned to Microeciella on the basis of the gonozooids, and a similar but distinctly smaller form is described as M. pollostos new species. A second new species—Hyporosopora nielsoni—is a rare colonist of hardground undersurfaces. The Carmel bryozoan fauna is compared with better-known faunas from the northern European Middle Jurassic. Species richness and colony-form diversity fall well within the expected values for bryozoan faunas of this age, and endemism is detectable only at relatively low taxonomic levels. Evolutionary patterns based on studies of contemperaneous European bryozoan faunas during this time of cyclostome evolutionary radiation are reinforced by the palaeogeographically distant Carmel bryozoan fauna.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 5 , September 1999 , pp. 816 - 830
Copyright
Copyright © The Paleontological Society 

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