Definitions for edmontosaurus

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Princeton's WordNet

  1. edmontosaurus(noun)

    duck-billed dinosaur from Canada found as a fossilized mummy with skin

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  1. Edmontosaurus

    Edmontosaurus is a genus of crestless hadrosaurid dinosaur. It contains two species: Edmontosaurus regalis and Edmontosaurus annectens. 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, while those of E. annectens were found in the same geographic region but in rocks dated to the end of the Maastrichtian stage of the Cretaceous, 65.5 million years ago. E. annectens was one of the last non-avian dinosaurs, and lived alongside dinosaurs like Triceratops horridus and Tyrannosaurus rex shortly before the Cretaceous–Paleogene extinction event. Edmontosaurus included some of the largest hadrosaurid species, measuring up to 12 metres long and weighing around 4.0 metric tons. Several well-preserved specimens are known that include not only bones, but in some cases extensive skin impressions and possible gut contents. It is classified as a genus of saurolophine hadrosaurid, a member of the group of hadrosaurids which lacked hollow crests. Edmontosaurus has a lengthy and complicated taxonomic history dating to the late 19th century. Specimens of Edmontosaurus have been classified with various genera including Claosaurus, Diclonius, Hadrosaurus, Thespesius, and Trachodon, and the well-known but possibly synonymous Anatosaurus and Anatotitan are now generally regarded as synonyms of Edmontosaurus. The first fossils named Edmontosaurus were discovered in southern Alberta, Canada, in the Horseshoe Canyon Formation. The type species, E. regalis, was named by Lawrence Lambe in 1917, although several other species that are now classified in Edmontosaurus were named earlier. The best known of these is E. annectens, originally named by Othniel Charles Marsh in 1892 as Claosaurus annectens and known for many years as Anatosaurus annectens.

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