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Reinterpretation of Stictostega Shaw, 1967, an Upper Cretaceous cheilostome bryozoan from Arkansas

Published online by Cambridge University Press:  14 July 2015

Paul D. Taylor  and
Frank K. McKinney
Paul D. Taylor
Affiliation:
Department of Palaeontology, The Natural History Museum, London SW7 5BD, England
Frank K. McKinney
Affiliation:
Department of Geology, Appalachian State University, Boone, NC 28608
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Abstract

The distinctive cheilostome bryozoan Stictostega durhami Shaw, 1967, from the Upper Campanian Ozan Formation of Arkansas, is redescribed and its relationships are reconsidered. Originally interpreted as a hippothoid ascophoran, the presence of a cryptocystal frontal shield and other characters suggest that it is a coilostegan anascan. Pores in the frontal shield are inferred to have served for the passage of parietal muscles (or their ligaments), which operated on the frontal membrane to raise hydrostatic pressure and protrude the lophophore in the same way as recently demonstrated in living Macropora. Stictostega is provisionally interpreted as a stem-group macroporid.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 1 , January 2000 , pp. 1 - 6
Copyright
Copyright © The Paleontological Society 2000

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