Caenagnathus

Chordata

Caenagnathus
Temporal range: Late Cretaceous, 75 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
Superfamily: Caenagnathoidea
Family: Caenagnathidae
Sternberg, 1940
Subfamily: Caenagnathinae
Sternberg, 1940
Genus: Caenagnathus
Sternberg, 1940
Species: C. collinsi
Binomial name
Caenagnathus collinsi
Sternberg, 1940

Caenagnathus ('recent jaw') is a genus of oviraptorosaurian dinosaur from the late Cretaceous (75 million years ago). It is known from a single lower jaw, found in the Dinosaur Park Formation of Alberta, Canada.

Taxonomic history

This dinosaur has a confusing history. In 1936, a set of jaws were found, and later given the name Caenagnathus, meaning 'recent jaw'; they were first thought to be those of a bird.[1] In 1988, a specimen from storage since 1923 was discovered and studied. This fossil were used to link the discoveries of several fragmentary oviraptorosaur species into a single dinosaur, which was assigned to the genus Chirostenotes, originally named for a pair of hands that were long considered to come from the same animal as Caenagnathus. Since the first name applied to any of these remains was Chirostenotes, this is the only name that is recognized as valid.[2] However, further study cast doubt on the idea that all of these fossils belonged to the same creature: while Chirostenotes was an advanced oviraptorosaurian and possibly an oviraptorid, Caenagnathus was shown to have been a more primitive animal.[3]

=References

  1. ^ Sternberg, R.M. (1940). A toothless bird from the Cretaceous of Alberta. Journal of Paleontology 14(1):81-85.
  2. ^ Currie, P.J., and Russell, D.A. (1988). Osteology and relationships of Chirostenotes pergracilis (Saurischia, Theropoda) from the Judith River (Oldman) Formation of Alberta, Canada. Canadian Journal of Earth Sciences 25:972-986.
  3. ^ Holtz, Thomas R. Jr. (2010) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.