Tyrannosaurus had a much wider range than other tyrannosaurids. It lived throughout what is now western North America, on what was then an island continent known as Laramidia. rex or colloquially T-Rex, is one of the best represented theropods. The species Tyrannosaurus rex ( rex meaning "king" in Latin), often called T. Tyrannosaurus is a genus of large theropod dinosaur. (Gilmore, 1946) Bakker, Williams & Currie, 1988 rex evolved in North America.(Gilmore, 1946) Charig in Appleby, Charig, Cox, Kermack & Tarlo, 1967 However, these findings are still preliminary, and other experts maintain that T. rex's skeletal features showed that the dinosaur king was more like two tyrannosaurs in Asia, Tarbosaurus and Zhuchengtyrannus, than it was to North American tyrannosaurs. It is possible that Tarbosaurus had evolutionary precedence, and spawned Tyrannosaurus rex when some hardy individuals crossed the Siberian land bridge into North America about 67 million years ago when the seaway between Asia and North America receded. Studies comparing nerve pathways in skulls of the two species also show significant differences, supporting the idea that Tarbosaurus and Tyrannosaurus are separate genera. rex had a shorter, more robust skull and less teeth. rex and the very closely related Tarbosaurus should both be in the same genus ( Tyrannosaurus, which was named before Tarbosaurus). Also, in this subfamily are the genera Alioramus, Teratophoneus, Daspletosaurus, Zhuchengtyrannus and Tarbosaurus Tyrannosaurus rex is a member of the family Tyrannosauridae and subfamily Tyrannosaurinae. Over 40 specimens of Tyrannosaurus rex have been identified, some of which are nearly complete skeletons, and at least one specimen has been reported with fossilised soft tissue and protein remains Evolutionary relationships Their maximum speed could have been up to 40km/hr. rex had binocular vision slightly better than that of modern hawks. Its brain was tiny in comparison with its huge body. Like other tyrannosaurs, it had a huge head with large cutting, serrated teeth. The function of the forelimbs is still not clear. Tyrannosaurus rex had sturdy and quite long legs and its forelimbs were reduced, a feature typical of all advanced tyrannosaurs. rex's teeth were wide and dull (rather than being flat and daggerlike), allowing the teeth to withstand the forces exerted by struggling prey.' Other behaviours and adaptations rex’s 'front teeth gripped and pulled its side teeth tore flesh, and its back teeth diced chunks of meat and forced food into the throat. This is known as a puncture-pull feeding strategy.Īccording to a 2012 study in the Canadian Journal of Earth Sciences, not all the teeth had the same function. They had no chewing teeth, they chomped, tore and swallowed. Their D-shaped teeth were serrated (like a steak knife) and 30 cm long, including the root. These giant predators used their strong and powerful jaws to crunch through flesh, bone and marrow. It is believed that unrelated individuals of different age and speed could have fed at the same meal. rex likely specialised in bringing down large dinosaurs, like the herbivores Edmontosaurus and Triceratops but probably also ate other tyrannosaurs. Tyrannosaurus rex was a carnivore, but may also have been an opportunistic scavenger. In 2000, crews organised by Jack Horner discovered five Tyrannosaurus skeletons near the Fort Peck Reservoir. The 1990s saw numerous discoveries, with nearly twice as many finds as in all previous years, including two of the most complete skeletons found to date: Sue and Stan. In the 1960s, there was renewed interest in Tyrannosaurus. rex in eastern Wyoming in 1900 he then found another partial skeleton in 1902 in Hell Creek, Montana The species was named in 1905 by Henry Fairfield Osborn, president of the American Museum of Natural History at the time. The famous fossil hunter Barnum Brown found the first partial skeleton of T. Teeth from what is now documented as a Tyrannosaurus rex were found in 1874 by Arthur Lakes near Golden, Colorado. As of 2020, there have been over 42 specimens (5-80% complete by bone count) discovered, including several almost complete skeletons. It is one of the best studied tyrannosaurs due to the number of specimens found. rex, was the largest tyrannosaur and the last of its family. Tyrannosaurus means 'tyrant lizard' in Greek and rex means 'king' in Latin. rex is one of the most popular and enduring dinosaurs of all, starring in movies and children’s shows as well as featuring in pop culture memorabilia.
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