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

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Abstract

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.

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Subject classification (UKÄ) – MANDATORY

  • Geology

Keywords

  • cretaceous, Albian, Pawpaw, sharks, Texas, volga, squalicorax
Original languageEnglish
Pages (from-to)939-950
JournalPalaeontology
Volume50
Issue number4
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes