, Volume 98, Issue 3, pp 241–246

Evidence for high taxonomic and morphologic tyrannosauroid diversity in the Late Cretaceous (Late Campanian) of the American Southwest and a new short-skulled tyrannosaurid from the Kaiparowits formation of Utah

  • Thomas D. Carr
  • Thomas E. Williamson
  • Brooks B. Britt
  • Ken Stadtman
Short Communication

DOI: 10.1007/s00114-011-0762-7

Cite this article as:
Carr, T.D., Williamson, T.E., Britt, B.B. et al. Naturwissenschaften (2011) 98: 241. doi:10.1007/s00114-011-0762-7


The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap between the Northern Rocky Mountain Region (Montana, Alberta) and the Southwest (New Mexico, Utah). Until recently, diagnostic tyrannosauroids from the Southwest were unknown until the discovery of Bistahieversor sealeyi from the late Campanian of New Mexico. Here we describe an incomplete skull and postcranial skeleton of an unusual tyrannosaurid from the Kaiparowits Formation (Late Cretaceous) of Utah that represents a new genus and species, Teratophoneus curriei. Teratophoneus differs from other tyrannosauroids in having a short skull, as indicated by a short and steep maxilla, abrupt angle in the postorbital process of the jugal, laterally oriented paroccipital processes, short basicranium, and reduced number of teeth. Teratophoneus is the sister taxon of the Daspletosaurus + Tyrannosaurus clade and it is the most basal North American tyrannosaurine. The presence of Teratophoneus suggests that dinosaur faunas were regionally endemic in the west during the upper Campanian. The divergence in skull form seen in tyrannosaurines indicates that the skull in this clade had a wide range of adaptive morphotypes.


Dinosauria Theropoda Tyrannosauroidea Kaiparowits Skull 

Supplementary material

114_2011_762_MOESM1_ESM.doc (15 kb)
ESM 1(DOC 14.8 kb)

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Thomas D. Carr
    • 1
  • Thomas E. Williamson
    • 2
  • Brooks B. Britt
    • 3
  • Ken Stadtman
    • 4
  1. 1.Department of BiologyCarthage CollegeKenoshaUSA
  2. 2.New Mexico Museum of Natural History and ScienceAlbuquerqueUSA
  3. 3.Department of Geological SciencesBrigham Young UniversityProvoUSA
  4. 4.Grand JunctionUSA

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