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Edmontosaurus annectens (meaning "connected lizard from Edmonton"), often colloquially and historically known as Anatosaurus (meaning "duck lizard"), is a species of flat-headed saurolophine hadrosaurid dinosaur from the late Maastrichtian age at the very end of the Cretaceous period, in what is now western North America.
†Edmontosaurus annectens; 73–66 Ma, Campanian to Maastrichtian ... It had a length of about 4 m (13 ft) and a weight of 350 kilograms (770 pounds).
Most known complete Edmontosaurus annectens and Edmontosaurus regalis skulls. Edmontosaurus is currently regarded as having two valid species: the type species E. regalis and E. annectens. [3] [17] E. regalis is known only from the Horseshoe Canyon Formation of Alberta, dating from the late Campanian age of the late Cretaceous period.
The name Edmontosaurus regalis (meaning "regal," or, more loosely, "king-sized"), [24] was coined in 1917 by Lawrence Lambe. Lambe found that his new dinosaur compared best to specimens of "Diclonius mirabilis" (now assigned to Edmontosaurus annectens) and drew attention to the size and robustness of Edmontosaurus regalis. [23]
Instead, other sites in the American West would come to provide many very complete specimens that would form the backbone of hadrosaur research. One such specimen was the very complete AMNH 5060 (belonging to Edmontosaurus annectens), recovered in 1908 by the fossil collector Charles Hazelius Sternberg and his three sons in Converse County ...
Size of three ankylopollexians (Edmontosaurus, Iguanodon, and Camptosaurus) compared to other ornithopods. Ankylopollexians varied greatly in size over the course of their evolution. [citation needed]. Jurassic genus Camptosaurus was small, no more than 5 metres (16 ft) in length and half a tonne in weight. [4]
A roughly 76-million-year-old Tyrannosaurus rex skull is set to be auctioned off in New York City. The 200-pound fossil could fetch up to $20 million.
The largest known land-dwelling artiodactyl was Hippopotamus gorgops with a length of 4.3 m (14 ft), a height of 2.1 m (6 ft 11 in), and a weight of 5 t (11,000 lb), [63] with its closely related European descendant, Hippopotamus antiquus, rivaling it, estimated to be 14.1 ft (4.3 m) in length and 7,700–9,300 lb (3,500–4,200 kg) in weight.