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Texanoceras, a new neptunoceratid cephalopod genus from the Upper Pennsylvanian Graham and Caddo Creek formations in north-central Texas

Published online by Cambridge University Press:  14 July 2015

Shuji Niko  and
Royal H. Mapes
Shuji Niko
Affiliation:
1Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8521, Japan,
Royal H. Mapes
Affiliation:
2Department of Geological Sciences, Ohio University, Athens, OH 45701, USA,
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Abstract

A neptunoceratid cephalopod, Texanoceras jacksboroensis n. gen. n. sp., is described from the Virgilian (Upper Pennsylvanian) Graham and Caddo Creek Formations in Texas, North America. The family Neptunoceratidae was previously represented by a single genus, Tetrapleuroceras. This new material provides important emendations to the diagnostic concept of the enigmatic family including shell orientation, mature modification and siphuncular structure. Although higher taxonomic position of Neptunoceratidae is difficult to determine at present, morphologic similarities between the family and the orthoceratid (?) family Brachycycloceratidae are discussed.

Information

Type
Research Article
Information
Journal of Paleontology , Volume 85 , Issue 3 , May 2011 , pp. 519 - 523
Copyright
Copyright © The Paleontological Society 

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