Postosuchus kirkpatricki was named by Chatterjee (1985) for rauisuchian material from the Post Quarry in the Upper Triassic Dockum Group of
About 10 years ago Jonathan Weinbaum started repreparing the type material (especially the skull) of Postosuchus, discovering a nearly complete skull under layers of paint, chicken wire, and plaster. His resulting MS thesis (Weinbaum, 2002) and PhD Dissertation (Weinbaum. 2008) provide the most up-to-date and accurate reconstruction of Postosuchus kirkpatricki. In 2008 Peyer et al. described a partial skeleton of a new species, Postosuchus alisonae, from the Upper Triassic of North Carolina. The reconstruction provided by Jeff Martz is based on these works.
Two side notes regarding the taxonomy of Postosuchus. The pelvis described by Case (1943) was found and donated to the University of Michigan Museum of Paleontology by a
Finally, Chatterjee (1985) named Postosuchus kirkpatricki for Mr. and Mrs. Kirkpatrick, therefore by ICZN conventions the specific name should actually be P. kirkpatrickorum. Since 1985 nobody has provided an emendation and the current volume of the code is ambiguous about whether an emendation should be made (as just recently discussed on the Dinosaur Mailing List).
The next post will discuss the bipedal/quadrupedal controversy...
The photo is the
Case, E. C. 1943. A new form of phytosaur pelvis. American Journal of Science 241:201–203.
Chatterjee, S. 1985. Postosuchus, a new thecodontian reptile from the Triassic of Texas and the origin of tyrannosaurs. Philosophical Transactions of the Royal Society of
Long, R. A., and P. A. Murry. 1995. Late Triassic (Carnian and Norian) tetrapods from the southwestern
Murry, P. A., and R. A. Long. 1989. Geology and paleontology of the Chinle Formation, Petrified Forest National Park and vicinity, Arizona and a discussion of vertebrate fossils of the southwestern Upper Triassic; pp. 29-64 in Lucas, S. G., and A. P. Hunt (eds.), Dawn of the Dinosaurs in the American Southwest, University of New Mexico Press, Albuquerque.
Peyer, K., Carter, J. G., Sues, H.-D., Novak, S. E., and P. E. Olsen. 2008. A new suchian archosaur from the Upper Triassic of North Carolina. Journal of Vertebrate Paleontology 28:363-381.
Weinbaum, J. C. 2002. Osteology and relationships of Postosuchus kirkpatricki (Archosauria: Crurotarsi). Unpublished MS thesis,
Weinbaum, J. C. 2008. Review of the Triassic reptiles Poposaurus gracilis and Postosuchus kirkpatricki (Reptilia: Archosauria). Unpublished PhD dissertation,