
Johan Lindgren
Universitetslektor

Anacoracid sharks from the Albian (lower cretaceous) Pawpaw shale of Texas
Författare
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.
Avdelning/ar
- Berggrundsgeologi
Publiceringsår
2007
Språk
Engelska
Sidor
939-950
Publikation/Tidskrift/Serie
Palaeontology
Volym
50
Issue
4
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Geology
Nyckelord
- cretaceous
- Albian
- Pawpaw
- sharks
- Texas
- volga
- squalicorax
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 1475-4983