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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.
Allosaurus sp. nov. Late Jurassic: Possible new species Arkhane: Big Al MOR 693 Museum of the Rockies: Allosaurus jimmadseni: Kimmeridgian: Morrison Formation: Almost complete specimen with multiple pathologies. Big Al: Big Al 2 SMA 0005 Saurier Museum: Allosaurus jimmadseni: Late Jurassic Morrison Formation: Big Al 2, the Allosaurus: Big Joe [155]
In 2024, re-examinations of the specimens attributed to Saurophaganax suggested that it is a chimera of multiple dinosaur genera, since some specimens most likely belong to a diplodocid sauropod, while the other referred allosaurid specimens belong to a novel species of Allosaurus, named as Allosaurus anax. [9]
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]
Specimen NMV P150070, known as "Allosaurus robustus" "Allosaurus robustus" is an informal name used for specimen "NMV P150070", a theropod astragalus known from the Wonthaggi Formation (Early Cretaceous) of Victoria, Australia. [7] When first studied, it was thought to have belonged to a species of Allosaurus.
Mounted skeletons of Tyrannosaurus (left) and Apatosaurus (right) at the AMNH. Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research.
The Allosaurus is now on display at the museum's R.B. Annis Mission Jurassic Paleo Lab, where a team is studying the fossil and clearing the matrix of rock around it. The legs are shown in a case ...
Alcovasaurus longispinus: Although originally named as a species of Stegosaurus, it may actually be a species of the otherwise European Miragaia. However, a later study has considered Miragaia a junior synonym of Dacentrurus, making Alcovasaurus a potentially distinct genus. Antrodemus valens: May represent the same animal as Allosaurus.