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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 largest dinosaur known from Australia, comparable in size to large South American dinosaurs. Potentially a synonym of the contemporary Diamantinasaurus [2] Australovenator: 2009 Winton Formation (Late Cretaceous, Cenomanian) Australia: Analysis of its arms suggests it was well-adapted to grasping [3] Austrosaurus: 1933
"Ischyrosaurus": The generic name Ischyrosaurus is preoccupied. The dinosaur may be a synonym of Ornithopsis. Koutalisaurus kohlerorum: Usually seen as a synonym of Pararhabdodon, but it could also be its own taxon. Kukufeldia tilgatensis: May be a synonym of Barilium. "Liassaurus huenei": Could potentially be a second specimen of Sarcosaurus.
The genus must appear on the List of dinosaur genera. At least one named species of the creature must have been found in South America. This list is a complement to Category:Mesozoic dinosaurs of South America.
Evidence suggests that all dinosaurs were egg-laying, and that nest-building was a trait shared by many dinosaurs, both avian and non-avian. While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances.
Non-avian Dinosaurs are a group of reptiles that dominated terrestrial ecosystems for over 160 million years, from around until , at the end of the Cretaceous period, [1] when all non-avian dinosaurs became extinct. Their remains have been found on every continent, including Antarctica.
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