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Parasaurolophus (/ ˌ p ær ə s ɔː ˈ r ɒ l ə f ə s,-ˌ s ɔːr ə ˈ l oʊ f ə s /; meaning "beside crested lizard" in reference to Saurolophus) [2] is a genus of hadrosaurid "duck-billed" dinosaur that lived in what is now western North America and possibly Asia during the Late Cretaceous period, about 76.9–73.5 million years ago. [3]
The type species was found in Canada. The Asian species is distinguished by its larger size and backwards-pointing diagonal crest Sauroplites: 1953 Zhidan Group (Early Cretaceous, Barremian to Aptian) China: Preserved lying on its back with parts of its armor in an articulated position Saurornithoides: 1924 Djadochta Formation (Late Cretaceous ...
Lambeosaurines originated on the continent of Laurasia during the Late Cretaceous, being initially found throughout modern Europe and Asia.Around the Campanian stage, lambeosaurines of the tribe Corythosauria colonized the landmass of Laramidia (modern western North America) via Beringia and spread as far south as Mexico, radiating into a diverse array of a body plans, including famous taxa ...
Artist's restoration of Parasaurolophus Mummified Edmontosaurus annectens. 1920. Matthew described the new genus Procheneosaurus. [9] Parks described the new species Kritosaurus incurvimanus. [6] 1922. William Parks described the new genus and species Parasaurolophus walkeri. [9] Krausel reported fossil gut contents from an Edmontosaurus ...
This cladogram is a recent modification of the original 2010 analysis, including more characters and taxa. The resulting cladistic tree of their analysis was resolved using Maximum-Parsimony. 61 hadrosauroid species were included, characterized for 273 morphological features: 189 for cranial features and 84 for postcranial features.
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 size of the two Saurolophus species compared to humans. Saurolophus is known from material including nearly complete skeletons, giving researchers a clear picture of its bony anatomy. S. osborni, the rarer Albertan species, was around 8.2–8.5 m (27–28 ft) long, with its skull 1.0 m (3.3 ft) long.
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.