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- Title
Diversity of late Maastrichtian Tyrannosauridae (Dinosauria: Theropoda) from western North America.
- Authors
Carr, Thomas D.; Williamson, Thomas E.
- Abstract
The tooth taxonAublysodon miranduswas reinstated following the collection of nondenticulate tyrannosaurid premaxillary teeth from late Maastrichtian deposits in western North America. A small skull from the Hell Creek Formation of Montana (the‘Jordan theropod’, LACM 28471), that was associated with a nondenticulate premaxillary tooth, was referred toAublysodonand the diagnosis was revised to include cranial bones. However, the‘premaxillary’ tooth of the specimen is actually a maxillary tooth. The small size ofAublysodoncrowns, and evidence that some denticles develop late in growth in theropods, indicates that the nondenticulate condition represents immaturity. Therefore,Aublysodonis a nomen dubium. The Jordan theropod was recently designated as the type specimen ofStygivenator molnari. A tyrannosaurid from the Hell Creek Formation of Montana (LACM 23845) was first referred toAlbertosauruscf.A. lancensisand then later became the type specimen ofDinotyrannus megagracilis. On the basis of shared derived characters and a quantitative reconstruction of the growth series ofTyrannosaurus rex, the type specimens ofS. molnariandD. megagracilisare juvenile and subadult specimens ofT. rex, respectively. There is currently evidence for only one tyrannosaurid species in the late Maastrichtian of western North America: T. rex. © 2004 The Linnean Society of London,Zoological Journal of the Linnean Society, 2004,142, 479–523.
- Subjects
NORTH America; TYRANNOSAURIDAE; DINOSAURS; FOSSIL teeth; ONTOGENY; ANIMAL classification
- Publication
Zoological Journal of the Linnean Society, 2004, Vol 142, Issue 4, p479
- ISSN
0024-4082
- Publication type
Article
- DOI
10.1111/j.1096-3642.2004.00130.x