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Early Cretaceous gymnolaemate bryozoans from the early to middle Albian of the Glen Rose and Walnut formations of Texas, USA

Published online by Cambridge University Press:  30 January 2019

Silviu O. Martha Open the ORCID record for Silviu O. Martha [Opens in a new window] ,
Paul D. Taylor  and
William L. Rader
Silviu O. Martha
Affiliation:
Senckenberg Forschungsinstitute und Naturmuseen, Sektion Marine Evertebraten III (Bryozoologie), Senckenberganlage 25, 60325 Frankfurt am Main, Germany 〈silviu.martha@senckenberg.de〉
Paul D. Taylor
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom 〈p.taylor@nhm.ac.uk〉
William L. Rader
Affiliation:
8210 Bent Tree Road, #219, Austin, Texas, USA 〈raderw66@gmail.com〉
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Abstract

Gymnolaemate bryozoans are common encrusters on bivalve shells from the early to middle Albian parts of the Glen Rose and Walnut formations of southcentral and northcentral Texas. Here, we report for the first time the presence of seven gymnolaemate bryozoans, all of which represent new species. They include the bioimmured ctenostome Simplicidium jontoddi n. sp., and the cheilostomes Rhammatopora glenrosa n. sp., Iyarispora ikaanakiteeh n. gen. n. sp., Iyarispora chiass n. gen. n. sp., Charixa bispinata n. sp., Charixa sexspinata n. sp., and Charixa emanuelae n. sp. The Glen Rose bryozoans slightly antedate the commencement of an explosive bryozoan radiation and the first appearance of neocheilostomes in the late Albian. Although the diversity of cheilostomes in the Glen Rose and Walnut formations is similar to that of cyclostomes, cheilostomes are more abundant and produced larger colonies. These formations therefore yield the oldest known bryozoan assemblage dominated in terms of biomass by cheilostomes. The genus concept of Charixa is discussed and amended.

UUID: http://zoobank.org/d9e8f1a4-ae6a-4455-abb3-3b0a75a7d294

Type
Articles
Information
Journal of Paleontology , Volume 93 , Issue 2 , March 2019 , pp. 260 - 277
Copyright
Copyright © 2019, The Paleontological Society 

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