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It contains the single type species: Tarbosaurus bataar, which is known from the Nemegt Formation of Mongolia, with more fragmentary remains found further afield in the Subashi Formation of China. Tarbosaurus is represented by dozens of fossil specimens, including several complete skulls and skeletons.
Estimated size compared to a human. Zhuchengtyrannus was a large carnivorous theropod, and the holotype has been estimated to have been "similar in size and gross morphology to Tarbosaurus", [1] which is about 10 metres (33 ft) in body length and 5 metric tons (5.5 short tons) in body mass.
Nomingia gobiensis: Notable as one of the first non-avian dinosaurs found with a pygostyle. It may, however, be a synonym of Elmisaurus. "Nurosaurus qaganensis": Noteworthy for preserving the first stress fracture found on a sauropod foot.
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.
Thomas Holtz found Appalachiosaurus to be an albertosaurine in 2004, [5] but his more recent unpublished work locates it just outside Tyrannosauridae, [18] in agreement with other authors. [19] The other major subfamily of tyrannosaurids is the Tyrannosauridae , including genera such as Daspletosaurus , Tarbosaurus , and Tyrannosaurus .
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Furthermore, the size of the specimen, a 1.1 in (2.8 cm) dentary from the lower jaw found in the Two Medicine Formation of Montana in 1983 and a foot claw found in the Horseshoe Canyon Formation in 2018 and described in 2020, suggests that neonate tyrannosaurids were born with skulls the size of a mouse or similarly sized rodents and may have ...