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Article: Anacoracid sharks from the Albian (Lower Cretaceous) Pawpaw Shale of Texas

Publication: Palaeontology
Volume: 50
Part: 4
Publication Date: July 2007
Page(s): 939 950
Author(s): Mikael Siverson, Johan Lindgren and L. Scott Kelley
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How to Cite

SIVERSON, M., LINDGREN, J., KELLEY, L. 2007. Anacoracid sharks from the Albian (Lower Cretaceous) Pawpaw Shale of Texas. Palaeontology50, 4, 939–950.

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Recent collecting from the Pawpaw Shale in north-east 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 a 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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