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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.
The largest species was Tyrannosaurus rex, the most massive known terrestrial predator, which measured over 13 metres (43 ft) in length [2] and according to most modern estimates up to 8.87 metric tons (9.78 short tons) in weight. [3] [4] Tyrannosaurids were bipedal carnivores with massive skulls filled with large teeth. Despite their large ...
[41] [36] Specimens possibly belonging to or similar to Tyrannosaurus rex and Torosaurus utahensis (identified as cf. Tyrannosaurus and Torosaurus cf. utahensis) have been discovered from the Javelina Formation, [42] [43] where other archosaurs diagnostic to the species level have been discovered including the chasmosaurine ceratopsid ...
The specimen's considerable size places it within the range of known T. rex individuals, suggesting the presence of large tyrannosaurids during the Campanian stage (~75 million years ago), a temporal range earlier than the established Maastrichtian age (~68–66 Ma) for Tyrannosaurus rex. However, the exact age and provenance of CM 9401 remain ...
A size comparison of various specimens of the theropod dinosaur genus Allosaurus. • Silhouettes are based on Allosaurus skeletal reconstructions by Scott Hartman and Henrique Paes , used with permission. I, the author, require that Scott Hartman, Henrique Paes and steveoc 86 at Wikimedia Commons get attribution.
Size is an important aspect of dinosaur paleontology, of interest to both the general public and professional scientists. Dinosaurs show some of the most extreme variations in size of any land animal group, ranging from tiny hummingbirds , which can weigh as little as two grams, to the extinct titanosaurs , such as Argentinosaurus and ...
Size of some small genera, compared to a human. Tyrannosauroids varied widely in size, although there was a general trend towards increasing size over time. Early tyrannosauroids were small animals. [3] One specimen of Dilong, almost fully grown, measured 1.6 meters (5.2 feet) in length, [4] and a fully grown Guanlong measured 3 meters (9.8 ...
Tyrannoraptora (Tyrannosaurus rex + P. domesticus) Coelurus fragilis; Tyrannosauroidea (T. rex > Ornithomimus velox, Deinonychus antirrhopus, A. fragilis) Dryptosauridae; Tyrannosauridae (T. rex + Tarbosaurus bataar + Daspletosaurus torosus + Albertosaurus sarcophagus + Gorgosaurus libratus) Tyrannosaurinae (T. rex > A. sarcophagus ...