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Achelousaurus
''Achelousaurus'' (commonly pronounced , though might be a better reflection of the butchered etymology;〔"Since the scientific name ''Achelousaurus'' was formed by arbitrarily combining ''Achelous'' () and ''saurus'' instead of using the stem-form ''Achelo-,'' the "u" needs to be pronounced."()〕 "Achelous's lizard") is a genus of centrosaurine ceratopsid dinosaurs from the Late Cretaceous Period of what is now North America, dated to 74.2 million years ago.〔Andrew T. McDonald & John R. Horner, (2010). "New Material of "Styracosaurus" ovatus from the Two Medicine Formation of Montana". Pages 156–168 in: Michael J. Ryan, Brenda J. Chinnery-Allgeier, and David A. Eberth (eds), ''New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium'', Indiana University Press, Bloomington and Indianapolis, IN.〕
==Description==
They were quadrupedal herbivores with parrot-like beaks, rough bosses (raised bony areas) on their snouts and one pair behind their eyes, and a pair of horns on the end of their long bony frills. With body lengths of up to six meters (20 feet) and a weight of three tonnes,〔Paul, G.S., 2010, ''The Princeton Field Guide to Dinosaurs'', Princeton University Press p. 263〕 ''Achelousaurus'' were medium-sized ceratopsians.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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