New Data on the Postcranial Anatomy of the California Mosasaur Plotosaurus bennisoni (Camp, 1942) (Upper Cretaceous: Maastrichtian), and the Taxonomic Status of P. tuckeri (Camp, 1942)

Johan Lindgren; Michael W. Caldwell; John W. M. Jagt

doi:10.1671/0272-4634-28.4.1043

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Johan Lindgren,¹ Michael W. Caldwell,² John W. M. Jagt³

¹University of California, Department of Integrative Biology and Museum of Paleontology, 1101 Valley Life Sciences Building, Berkeley, CA 94720-4780, U.S.A., and Department of Geology, GeoBiosphere Science Centre, Lund University, Sölvegatan 12, SE-22
²University of Alberta, Department of Earth and Atmospheric Sciences, and Department of Biological Sciences, Edmonton, Alberta, Canada T6G 2E9, mw.caldwell@ualberta.ca
³Natuurhistorisch Museum Maastricht, de Bosquetplein 6-7, NL-6211 KJ Maastricht, The Netherlands, john.jagt@maastricht.nl

Abstract

New axial and appendicular material permits a detailed re-description of the postcranial skeleton of the derived mid-Maastrichtian California mosasaur genus Plotosaurus. Centrum morphology, vertebral process shape, and extreme hyperphalangy provide compelling evidence to demonstrate that Plotosaurus achieved the highest level of aquatic adaptation among mosasaurs. A re-examination of the type material of P. bennisoni and of P. tuckeri indicates that only one taxon, P. bennisoni, is present, of which P. tuckeri is a junior synonym.

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Johan Lindgren, Michael W. Caldwell, and John W. M. Jagt "New Data on the Postcranial Anatomy of the California Mosasaur Plotosaurus bennisoni (Camp, 1942) (Upper Cretaceous: Maastrichtian), and the Taxonomic Status of P. tuckeri (Camp, 1942)," Journal of Vertebrate Paleontology 28(4), 1043-1054, (1 December 2008). https://doi.org/10.1671/0272-4634-28.4.1043

Accepted: 1 March 2008; Published: 1 December 2008

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