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Anchisaurus
''Anchisaurus'' is a genus of basal sauropodomorph. An early herbivorous dinosaur, it lived during the Early Jurassic Period; more specifically, the Pliensbachian to Toarcian ages, 190 to 174 million years ago. Until recently it was classed as a member of Prosauropoda. The name comes from the Greek ''αγχι''/''agkhi'' anchi-; "near, close" + Greek ''σαυρος''/''sauros''; "lizard", probably referring to Marsh's interpretation of it as intermediate between primitive dinosaurs (at the time ''Palaeosaurus'' was an example of what was thought to be a primitive dinosaur) and more derived dinosaurs. ''Anchisaurus'' was coined as a replacement name for ''Amphisaurus'', which was itself a replacement name for Hitchcock's ''Megadactylus'', both of which had already been used for other animals.
Hitchcock collected these bones under the name ''Megadactylus'' in 1865. However, the name was already in use, and paleontologist Othniel Charles Marsh renamed it ''Anchisaurus'' in 1885. Remains thought to belong to this genus were found in South Africa and China, adding to the theory that these land masses were at the time joined in one super-continent, Pangaea, but these assignments have been contentious (''Gyposaurus''). A recovery from Nova Scotia may also be an ''Anchisaurus'' but this is unconfirmed.
==Description==
''Anchisaurus'' was a rather small dinosaur, with a length of just over , which helps explain why it was once mistaken for human bones.〔"Anchisaurus." In: Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. ''The Age of Dinosaurs''. Publications International, LTD. p. 27. ISBN 0-7853-0443-6.〕 It probably weighed around . However, Marsh's species ''A. major'' (also known as ''Ammosaurus'') was larger, from and some estimates give it a weight of up to .
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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