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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Carnosaurs
Temporal range:
Middle JurassicLate Cretaceous, 175.6–70 Ma
Giganotosaurus carolinii DSC 2949.jpg
Replica Giganotosaurus carolinii skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Clade: Avetheropoda
Infraorder: Carnosauria
von Huene, 1920
Subgroups

Gasosaurus
Becklespinax
Yuanmouraptor
Allosauroidea

Carnosauria is a large group of predatory dinosaurs that lived during the Jurassic and Cretaceous periods. While it originally contained a wide assortment of giant theropods that were not closely related, the group has since been defined to encompass only the allosaurs and their closest kin. Starting from the 1990s, scientists have discovered some very large carnosaurs in the carcharodontosaurid family, such as Giganotosaurus and Tyrannotitan which are among the largest known predatory dinosaurs.

Distinctive characteristics of carnosaurs 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).

Carnosaurs first appeared in the Middle Jurassic, around 176 mya. The last definite known carnosaurs, the carcharodontosaurs, became extinct in the Turonian epoch of the Cretaceous, roughly 90 mya; reportedly later remains of carcharodontosaurids, from the Campanian and Maastrichtian epochs, are likely misidentified remains of abelisaurids.[1] The phylogenetically problematic megaraptorans, which may not be carnosaurs, became extinct around 84 mya.

Systematics[edit]

Modern cladistic analysis defines Carnosauria as those tetanurans sharing a more recent common ancestor with Allosaurus than with modern birds.[2]

Taxonomy[edit]

Carnosauria has traditionally been used as a dumping ground for all large theropods. Even non-dinosaurs, such as the rauisuchian Teratosaurus, were once considered carnosaurs. However, analysis in the 1980s and 1990s revealed that other than size, the group shared very few characteristics, making it polyphyletic. Most former carnosaurs (such as the megalosaurids, the spinosaurids, and the ceratosaurs) were reclassified as more primitive theropods. Others (such as the tyrannosaurids) that were more closely related to birds were placed in Coelurosauria.

Phylogeny[edit]

The clade Allosauroidea was originally proposed by Phil Currie and Zhao (1993; p. 2079), and later used as an undefined stem-based taxon by Paul Sereno (1997). Sereno (1998; p. 64) was the first to provide a stem-based definition for the Allosauroidea, defining the clade as "All neotetanurans closer to Allosaurus than to Neornithes." Kevin Padian (2007) used a node-based definition, defined the Allosauroidea as Allosaurus, Sinraptor, their most recent common ancestor, and all of its descendants. Thomas R. Holtz and colleagues (2004; p. 100) and Phil Currie and Ken Carpenter (2000), among others, have followed this node-based definition. However, in some analyses (such as Currie & Carpenter, 2000), the placement of the carcharodontosaurids relative to the allosaurids and sinraptorids is uncertain, and therefore it is uncertain whether or not they are allosauroids (Currie & Carpenter, 2000).

The cladogram presented here follows the 2010 analysis by Benson, Carrano and Brusatte.[3]

Allosauroidea

MetriacanthosauridaeYangchuanosaurus NT (flipped).jpg




AllosaurusAllosaurus Revised.jpg


Carcharodontosauria

CarcharodontosauridaeGiganotosaurus BW.jpg



NeovenatoridaeGualicho shinyae restoration.jpg





"Carnosaurus"[edit]

Not to be confused with Carnotaurus

"Carnosaurus" is an informal generic name, attributed to Friedrich von Huene, 1929; it a typographical error created by the translation of the von Huene monograph from German to Spanish because von Huene himself intended to assign indeterminate remains to Carnosauria incertae sedis.

References[edit]

  1. ^ Delcourt, R.; Grillo, O.N. (2017). "Carcharodontosaurids remained extinct in the Campanian-Maastrichtian: Reassessment of a fragmentary maxilla from Presidente Prudente Formation, Brazil". Cretaceous Research. doi:10.1016/j.cretres.2017.09.008. 
  2. ^ "What do terms like monophyletic, paraphyletic and polyphyletic mean?". 
  3. ^ Benson, R.B.J.; Carrano, M.T; Brusatte, S.L. (2010). "A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic". Naturwissenschaften. 97 (1): 71–78. Bibcode:2010NW.....97...71B. doi:10.1007/s00114-009-0614-x. PMID 19826771. 

Sources[edit]

  • George Olshevsky. "Re: What are these dinosaurs". Retrieved 2007-01-29.  (on "Carnosaurus")
  • Currie, P. J.; Zhao, X. (1993). "A new carnosaur (Dinosauria, Theropoda) from the Upper Jurassic of Xinjiang, People's Republic of China". Canadian Journal of Earth Sciences. 30 (10): 2037–2081. Bibcode:1993CaJES..30.2037C. doi:10.1139/e93-179. 
  • 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. Bibcode:1997AREPS..25..435S. doi:10.1146/annurev.earth.25.1.435. 
  • 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. 

External links[edit]

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