Texanoceras, a New Neptunoceratid Cephalopod Genus from the Upper Pennsylvanian Graham and Caddo Creek Formations in North-Central Texas

Shuji Niko; Royal H. Mapes

doi:10.1666/10-048.1

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Shuji Niko,¹ Royal H. Mapes²

¹Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8521, Japan ⟨ ⟩ niko@hiroshima-u.ac.jp
²Department of Geological Sciences, Ohio University, Athens, OH 45701, USA ⟨ ⟩ mapes@ohio.edu

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.

Citation Download Citation

Shuji Niko and Royal H. Mapes "Texanoceras, a New Neptunoceratid Cephalopod Genus from the Upper Pennsylvanian Graham and Caddo Creek Formations in North-Central Texas," Journal of Paleontology 85(3), 519-523, (1 May 2011). https://doi.org/10.1666/10-048.1

Accepted: 1 November 2010; Published: 1 May 2011

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