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Allosaurus (/ ˌ æ l ə ˈ s ɔːr ə s /) [1] [2] is an extinct genus of large carnosaurian theropod dinosaur that lived 155 to 145 million years ago during the Late Jurassic period (Kimmeridgian to late Tithonian ages). The name "Allosaurus" means "different lizard", alluding to its unique (at the time of its discovery) concave vertebrae.
Diagram of the forelimb of Allosaurus showing the principal segments of the limb limb The limbs form, together with the girdles, part of the appendicular skeleton. Fore- and hind limbs are very similar in structure, and are segmented into three principal parts. [1]
This list of non-avian theropod type specimens is a list of fossils that are the official standard-bearers for inclusion in the Mesozoic species and genera of the dinosaur clade Theropoda, which includes the carnivorous dinosaurs like Tyrannosaurus and Velociraptor, their herbivorous relatives like the therizinosaurs, and birds.
Allosaurus [6] A. fragilis. 44 - 60 The largest theropod reported from the quarry Allosaurus mounted skeleton Tanycolagreus: Ceratosaurus. C. dentisulcatus (may just represent the adult form of C. nasicornis) 1 The rarest theropod species in the quarry Marshosaurus. M. bicentesimus. 2 Stokesosaurus. S. clevelandi. 2 The largest coelurosaur ...
• Alamosaurus silhouette modified from skeletal reconstructions by Scott Hartman, used with permission. [1] The size of TMM 43621-1 is based on Lehman & Coulson 2002 [4] and the sizes of USNM 15560 and BIBE 45854 are from a diagram by Scott Hartman. [1] • The humans are scaled to 170 cm (5 ft 7 in) and 160 cm (5 ft 3 in) respectively.
It has been described as its own genus, [4] or as a species of Allosaurus: Allosaurus maximus. [7] A review of basal tetanurans in 2004 and Carrano et al.'s comprehensive 2012 analysis of Tetanurae accepted Saurophaganax as a distinct genus. [8] [9] Possible Saurophaganax material from New Mexico may clear up the status of the genus. [10]
Antrodemus became the accepted name for this familiar genus for over fifty years until James Madsen published on the Cleveland-Lloyd specimens of Allosaurus and concluded that the Allosaurus name should be used because Antrodemus was based on material with poor, if any, diagnostic features and locality information (for example, the geological ...
An Allosaurus pubic foot shows marks by the teeth of another theropod, probably Ceratosaurus or Torvosaurus. The location of the bone in the body (along the bottom margin of the torso and partially shielded by the legs) and the fact that it was among the most massive in the skeleton indicates that the Allosaurus was being scavenged. [52]