Journal article
A new species of Borealosuchus (Crocodyliformes, Eusuchia) from the Late Cretaceous-early Paleogene of New Jersey
Journal of Vertebrate Paleontology, Vol.32(1), pp.105-116
01/01/2012
DOI: 10.1080/02724634.2012.633585
Abstract
A lower jaw and associated postcranial remains from the Late Cretaceous-early Paleocene Hornerstown Formation of New Jersey form the basis of a new crocodyliform species, Borealosuchus threeensis. Although one of the oldest known species of Borealosuchus, phylogenetic analysis supports a closer relationship to Borealosuchus from the early Eocene than with other Late Cretaceous or early Paleocene forms. This is based on the shared presence of a short mandibular symphysis excluding the splenial, a small external mandibular fenestra, and ventral osteoderms composed of two sutured ossifications. It is also similar to Borealosuchus material from the Paleocene of western Texas, though conspecificity cannot be demonstrated at present. A close relationship with the basal alligatoroids Leidyosuchus or Diplocynodontinae is not supported. The distribution of lower jaws with very small slit-like external mandibular fenestrae, or no fenestrae at all, among basal crocodylian lineages (including Borealosuchus) and close crocodylian relatives suggests the fenestrae may have been ancestrally absent in Crocodylia and regained two or more times. Current phylogenetic hypotheses are consistent with dispersal of more-derived species of Borealosuchus to the Western Interior during the Paleocene, and they indicate the presence of several unsampled lineages crossing the Cretaceous-Paleogene boundary.
Details
- Title: Subtitle
- A new species of Borealosuchus (Crocodyliformes, Eusuchia) from the Late Cretaceous-early Paleogene of New Jersey
- Creators
- Christopher A Brochu - Department of Geoscience , University of IowaDavid C Parris - Bureau of Natural History , New Jersey State MuseumBarbara Smith Grandstaff - School of Veterinary Medicine , University of PennsylvaniaRobert K Denton - GeoConcepts Engineering, IncWilliam B Gallagher - Department of Geological, Environmental, & Marine Sciences , Rider University
- Resource Type
- Journal article
- Publication Details
- Journal of Vertebrate Paleontology, Vol.32(1), pp.105-116
- Publisher
- Taylor & Francis Group
- DOI
- 10.1080/02724634.2012.633585
- ISSN
- 0272-4634
- eISSN
- 1937-2809
- Language
- English
- Date published
- 01/01/2012
- Academic Unit
- University College Courses; Earth and Environmental Sciences
- Record Identifier
- 9983984532502771
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