Edmontosaurus regalis
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Edmontosaurus regalis Temporal range: Late Cretaceous,73–70 Ma |
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| Holotype skeleton of Thespesius edmontoni, now thought to be a young E. regalis | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Suborder: | †Ornithopoda |
| Family: | †Hadrosauridae |
| Subfamily: | †Saurolophinae |
| Genus: | †Edmontosaurus |
| Species: | †E. regalis |
| Binomial name | |
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Edmontosaurus regalis Lambe, 1917 |
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| Synonyms | |
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Thespesius edmontoni Gilmore, 1924 |
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Thespesius edmontoni Gilmore, 1924
Edmontosaurus regalis is a species of comb-crested hadrosaurid (duck-billed) dinosaur. Fossils of E. regalis have been found in rocks of western North America that date from the late Campanian stage of the Cretaceous Period 73 million years ago. E. regalis was widely distributed across western North America, with fossil remains found from northern Alaska to Colorado.
E. regalis was one of the largest hadrosaurids, measuring up to 12 metres (39 ft) long and weighing around 4.0 metric tons (4.4 short tons). It is classified as a genus of saurolophine (or hadrosaurine) hadrosaurid, a member of the group of hadrosaurids which lacked large, hollow crests, instead having smaller solid crests or fleshy combs. The distribution of E. regalis fossils suggests that it preferred coasts and coastal plains. It was a herbivore that could move on both two legs and four. Because it is known from several bone beds, E. regalis is thought to have lived in groups. The wealth of fossils has allowed researchers to study its paleobiology in detail, including its brain, how it may have fed, and its injuries and pathologies.
Edmontosaurus regalis is known from several fossil specimens.E. regalis was among the largest hadrosaurids. A fully grown adult could have been 9 metres (30 ft) long, and some of the larger specimens reached the range of 12 metres (39 ft) to 13 metres (43 ft) long. Its weight was on the order of 4.0 metric tons (4.4 short tons). The type specimen of E. regalis, NMC 2288, is estimated as 9 to 12 metres (30 to 39 ft) long.
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