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The internal features of some Paleozoic rhynchonellid brachiopods

Published online by Cambridge University Press:  14 July 2015

Norman M. Savage  and
Eric H. Goodwin
Norman M. Savage
Affiliation:
Department of Geological Sciences, University of Oregon, Eugene 97403
Eric H. Goodwin
Affiliation:
Department of Geological Sciences, University of Oregon, Eugene 97403
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Abstract

The genera Lissopleura, Sphaerirhynchia, Pectorhyncha, Yanishewskiella, and Terebratuloidea have been investigated to elucidate their internal features and taxonomic relationships. Specimens of the type species of these genera were sectioned. Lissopleura remains slightly enigmatic in that the holotype of Lissopleura aequivalvis is thinner and has a less pronounced fold than most specimens in the collection, including the one sectioned by us. The holotype is probably immature and is within the range of variation of specimens from the type area. The internal features lead us to assign Lissopleura to the Trigonirhynchiidae. Sphaerirhynchia wilsoni has a short septalium without a cover plate and other features that place it in the Hebetoechiidae. Pectorhyncha obtusiplicata has a very thick shell and a septalium filled by a large, bilobed cardinal process. The genus has several features similar to Obturamentella, and is assigned to the Obturamentellidae. Yanishewskiella angulata, which is retained within the Tetracameridae, has a spondylium with lateral buttresses, and a septalium into which the medium septum projects. Terebratuloidea davidsoni has small dental plates, and is assigned to the Allorhynchidae.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 3 , May 1998 , pp. 437 - 441
Copyright
Copyright © The Paleontological Society 

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