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iAllosauroidea
Fossil range: Early JurassicCretaceous
Allo
Animated Allosaurus, an allosauroid
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosaur
Order: Saurischia
Suborder: Theropoda
Infraorder: Carnosauria
Superfamily: Allosauroidea
Families

Sinraptoridae
Carcharodontosauridae
Allosauridae

Allosauroidea is a clade subdivided into three families — the Sinraptoridae, Carcharodontosauridae and Allosauridae. The taxon was originally proposed by Currie and Zhao (1993; p. 2079), then noted as an undefined stem-based taxon by Sereno (1997). Later, Sereno (1998; p. 64) provided a stem-based definition for the Allosauroidea, defining the clade as "All neotetanurans closer to Allosaurus than to Neornithes." Most recently, Holtz et al. (2004; p. 100) defined the Allosauroidea as "Allosaurus fragilis, Sinraptor dongi, their most recent common ancestor, and all of its descendants."

The oldest-known allosauroid, Cryolophosaurus, appears in the Early Jurassic (Pliensbachian) of Antarctica, and the latest-known survivor of the clade is Allosaurus fragilis (Late Jurassic, Tithonian). Allosauroids have long, narrows skulls, large orbits, three-digit hands, and usually have "horns" or ornamental crests on their heads. The most famous and best understood allosauroid is the North American genus Allosaurus.

References

  • Currie, P. J., and X. Zhao. 1993. A new carnosaur (Dinosauria, Theropoda) from the Upper Jurassic of Xinjiang, People's Republic of China. Canadian Journal of Earth Sciences 30:2037-2081.
  • Holtz, T. R., Jr. and Osmólska H. 2004. Saurischia; pp. 21-24 in D. B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria (2nd ed.), University of California Press, Berkeley.
  • Sereno, P. C. 1997. The origin and evolution of dinosaurs. Annual Review of Earth and Planetary Sciences 25:435-489.
  • Sereno, P. C. 1998. A rationale for phylogenetic definitions, with application to the higher-level taxonomy of Dinosauria. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 210:41-83.


Smallwikipedialogo.png This page uses content from Wikipedia. The original article was at Allosauroidea. The list of authors can be seen in the page history. As with Paleontology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.

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