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Cassiavellia galtarae, new species, new genus: a new Permian bivalve and its significance for pterioidean systematics

Published online by Cambridge University Press:  14 July 2015

Ilya Tëmkin  and
John Pojeta Jr.
Ilya Tëmkin
Affiliation:
1Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA 2Department of Invertebrate Zoology, National Museum of Natural History, 10th and Constitution Ave, NW, Washington, DC 20013-7012,
John Pojeta Jr.
Affiliation:
3Department of Paleobiology and U.S. Geological Survey, National Museum of Natural History, 10th and Constitution Ave, NW, Washington, DC 20013-7012, USA,
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Abstract

An exceptionally well-preserved silicified bivalve from the Upper Permian of Texas is described and assigned to a new genus and species, Cassiavellia galtarae, placed in the family Bakevelliidae. The species represents one of the earliest and best characterized unequivocal occurrences of the multivincular ligament in the superfamily Pterioidea. The silicified material provides a wealth of information on the morphology of inadequately known Paleozoic pterioideans, including hitherto undescribed aspects of the larval shell, auricular sulcus, muscle scars, and dental ontogeny. The discovery of the condyle-fossa complex on the anteroventral shell margin, a feature previously undescibed in Bivalvia, raises the question of the homology and taxonomic significance of the problematic subumbonal ridge-like structures in Pterioidea. In life, C. galtarae was probably an epifaunal right-pleurothetic bivalve, byssally attached to hard or raised flexible substrata. In addition to C. galtarae, another new species, C. nadkevnae, is placed in Cassiavellia.

Type
Research Article
Information
Journal of Paleontology , Volume 84 , Issue 6 , November 2010 , pp. 1152 - 1176
Copyright
Copyright © The Paleontological Society 

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