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Gorgosaurus (/ ˌ ɡ ɔːr ɡ ə ˈ s ɔːr ə s / GOR-gə-SOR-əs; lit. ' dreadful lizard ' ) is a genus of tyrannosaurid theropod dinosaur that lived in western North America during the Late Cretaceous Period ( Campanian ), between about 76.5 and 75 million years ago . [ 1 ]
Like most known tyrannosaurids, Gorgosaurus was a bipedal predator weighing more than a metric ton as an adult; dozens of large, sharp teeth lined its jaws, while its two-fingered forelimbs were comparatively small. Gorgosaurus was most closely related to Albertosaurus, and more distantly related to the larger Tyrannosaurus.
†Gorgosaurus †Hainosaurus †Hamites; Life restoration of the Late Cretaceous toothed bird Hesperornis †Hesperornis †Hesperornis regalis – or unidentified comparable form; Hiatella – tentative report †Hoplitosaurus †Hoplitosaurus marshi – type locality for species †Hoploparia †Hoploscaphites †Hoploscaphites comprimus
Size comparison between a person and Inostrancevia (reconstructed with long lips and some hair). Earlier gorgonopsids in the Middle Permian were quite small, with skull lengths of 10–15 cm (4–6 in), [1] whereas some later genera attained massive, bear-like sizes with the largest being Inostrancevia up to 3.5 m (11 ft) in length and 300 kg (660 lb) in body mass. [2]
Gorgosaurus libratus was formally reassigned to Albertosaurus (as Albertosaurus libratus) by Dale Russell in 1970, [4] with many subsequent authors following his lead. [19] [21] Combining the two greatly expands the geographical and chronological range of the genus Albertosaurus. Other experts maintain the two genera as separate. [5]
The genus must appear on the List of dinosaur genera. At least one named species of the creature must have been found in North America. This list is a complement to Category:Mesozoic dinosaurs of North America.
Acesta † Achrostichites – or unidentified comparable form † Achrostichites linnaeafolius Acirsa † Acutostrea † Acutostrea plumosa † Adocus Illustration of the reconstructed skeleton of the Late Triassic Aetosaurus. Othniel Charles Marsh (1895). † Aetosaurus † Aldebarania – type locality for genus † Aldebarania arenitea – type locality for species † Alinka – type ...
The supposed speed of Struthiomimus was, in fact, its main defense from predators (although it may also have been able to lash out with its hind claws when cornered), such as the dromaeosaurids (e.g. Saurornitholestes and Dromaeosaurus) and tyrannosaurs (e.g. Daspletosaurus and Gorgosaurus), which lived at the same time. It is estimated to have ...