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Tetanurae
Fossil range: Middle JurassicRecent
Possible Late Triassic record
Tetanurae skelgon
Skeletons of different tetanurans
Scientific classification

Class:

Reptilia

Superorder:

Dinosauria

Order:

Saurischia

Suborder:

Theropoda

(Unranked) :

Tetanurae Gauthier, 1986

Subdivisions:

Tetanurae, or "stiff tails", is a clade that includes most theropod dinosaurs, as well as birds. Tetanurans (or tetanurines) first appear during the early or middle Jurassic Period.

DefinitionEdit

Monolophosaurus jiangi jmallon

Illustration of the carnosaur Monolophosaurus

Tetanurae meaning "stiff tails", was named by Jacques Gauthier on cladistic grounds in 1986 for a large group of theropod dinosaurs. Gauthier's paper was the first serious application of the science of cladistics to vertebrate paleontology.

Tetanurae are defined as all theropods more closely related to modern birds than to Ceratosaurus (e.g. Padian et al., 1999). Gauthier considered it to consist of Carnosauria and Coelurosauria, although many of what he considered carnosaurs have been regarded as coelurosaurs or basal tetanurans by subsequent workers (but see Rauhut, 2003). Paul Sereno (1999) named Neotetanurae for the node joining Carnosauria (his Allosauroidea) and Coelurosauria, excluding other tetanurans such as spinosauroids. Padian et al. (1999) gave a synonymous definition for Gregory Paul's (1988) Avetheropoda, but this definition was published slightly later.

RangeEdit

It is not entirely clear where the origins of Tetanurae are. Cryolophosaurus has been claimed as the first true member of the group, although this identification has been disputed and Cryolophosaurus now appears to be closer to the dilophosaurids). Even if Cryolophosaurus was a tetanuran, this leaves no true tetanuran fossils from the Triassic, when the group should have originated based on the presence of coelophysoids (if the old definition of Ceratosauria is used). This gives heavier validity to the more recent view of tetanurans and ceratosaurs sharing a common ancestor and forming a clade of advanced theropods together.

Large, predatory spinosaurids and allosaurids flourished during the Late Jurassic and Early Cretaceous, especially in Gondwana, but seem to have died out before the end of the Cretaceous, possibly due to competition from abelisaurid ceratosaurs and tyrannosaurid coelurosaurs. The diverse coelurosaurs persisted until the end of the Mesozoic Era, when all except for crown clade avians died out. Modern birds are the only living representatives of the clade Tetanurae.

Popular tetanuransEdit

Many popular dinosaurs are tetanurans, including Allosaurus, Oviraptor, Spinosaurus, Tyrannosaurus, Velociraptor, as well as the ancient bird Archaeopteryx and all species of modern birds. The first Mesozoic dinosaur to be named was Megalosaurus bucklandii, a basal tetanuran.

ReferencesEdit

  • Gauthier, J. A. 1986. Saurischian monophyly and the origin of birds. pp. 1-55 In Padian, K. (ed.) The Origin of Birds and the Evolution of Flight. Memoirs of the California Academy of Sciences 8.
  • Padian, K., Hutchinson, R. M., and Holtz, Jr., T. R. 1999. Phylogenetic definitions and nomenclature of the major taxonomic categories of the carnivorous Dinosauria (Theropoda). Journal of Vertebrate Paleontology 19(1):69-80.
  • Paul, G. S. 1988. Predatory Dinosaurs of the World. Simon and Schuster, New York.
  • Rauhut, O. W. M. 2003. The interrelationships and evolution of basal theropod dinosaurs. Special Papers in Palaeontology 69:1-213.
  • Sereno, P. C. 1999. The evolution of dinosaurs. Science 284:2137-2147.

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