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Johan Lindgren

Johan Lindgren

Senior lecturer

Johan Lindgren

Anacoracid sharks from the Albian (lower cretaceous) Pawpaw shale of Texas

Author

  • Mikael Siverson
  • Johan Lindgren
  • L. Scott Kelley

Summary, in English

Recent collecting from the Pawpaw Shale in northeast Texas has yielded several hundred teeth of anacoracid sharks. The material allows for a much-needed revision of the Late Albian anacoracids from North America. The previously recognized Squalicorax sp., also referred to as S. volgensis in more recent publications, is a mix of two different species: S. priscoserratus sp. nov. and S. pawpawensis sp. nov. In addition to these two new species, a single tooth is assigned to S. aff. S. baharijensis. Our data indicate that anacoracids were considerably more diverse group in the North American Cretaceous than previously thought. We attribute much of the underestimation of diversity to vague species concepts, poor preparation techniques and the associated lack of attention to certain dental features, in particular neck morphology, root surface porosity and the root's vascularization.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2007

Language

English

Pages

939-950

Publication/Series

Palaeontology

Volume

50

Issue

4

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Geology

Keywords

  • cretaceous
  • Albian
  • Pawpaw
  • sharks
  • Texas
  • volga
  • squalicorax

Status

Published

ISBN/ISSN/Other

  • ISSN: 1475-4983