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Carnosauria
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Carnosaurs were large predatory dinosaurs that lived during the Jurassic and Cretaceous periods. The best known dinosaur in this group is Allosaurus. Recently, scientists have discovered some very large carnosaurians in the carcharodontosaurid group such as Giganotosaurus and Tyrannotitan which may have grown to larger sizes than the famous coelurosaur Tyrannosaurus.
Their defining characterisitics include large eyes, a long narrow skull and modifications of the legs and pelvis such as the thigh (femur) being longer than the shin (tibia).
Contents
- 1 Traditional "Carnosaurs"
- 2 Classification
- 3 "Carnosaurus"
- 4 References
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Traditional "Carnosaurs"
Carnosauria has traditionally been used as a dumping ground for all large theropods, but analysis in the 1980s and 1990s revealed that other than size, the group shared very few characteristics. Most former carnosaurs were
reclassified as more primitive theropods; or were placed in
Coelurosauria if they were more closely related to birds, like the
tyrannosaurids. Other former "carnosaurs" include the
megalosaurids, the
spinosaurids, and the
ceratosaurs. Even non-dinosaurs have been considered carnosaurs, such as the
rauisuchian Teratosaurus.
Modern cladistic analysis defines Carnosauria as those dinosaurs sharing a more recent common ancestor with Allosaurus than with modern birds [1].
Classification
"Carnosaurus"
"Carnosaurus" is an informal generic name, attributed to Friedrich von Huene, 1929, that is sometimes seen in lists of dinosaurs. It is probably a typographical error; von Huene intended to assign indeterminate remains to Carnosauria incertae sedis, but at some point in the process of publication, the text was revised to make it appear that he was creating a new generic name "Carnosaurus" (as described by George Olshevsky in a 1999 post to the Dinosaur Mailing List). The name is undescribed and has not been used seriously.
References
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