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Haplocanthosaurus
''Haplocanthosaurus'' (meaning "simple spined lizard") is a genus of sauropod dinosaur. Two species, ''H. delfsi'' and ''H. priscus'', are known from incomplete fossil skeletons. It lived during the late Jurassic period (Kimmeridgian stage), 155 to 152 million years ago.〔Turner, C.E. and Peterson, F., (1999). "Biostratigraphy of dinosaurs in the Upper Jurassic Morrison Formation of the Western Interior, U.S.A." Pp. 77–114 in Gillette, D.D. (ed.), ''Vertebrate Paleontology in Utah''. Utah Geological Survey Miscellaneous Publication 99-1.〕 The type species is ''H. priscus'', and the referred species ''H. delfsi'' was discovered by a young college student named Edwin Delfs in Colorado, USA. ''Haplocanthosaurus'' specimens have been found in the very lowest layer of the Morrison Formation, along with ''Hesperosaurus'', ''Brontosaurus yahnahpin'', and ''Allosaurus jimmadensi''.〔Foster, J. (2007). ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. 389pp.〕
==Description==
''Haplocanthosaurus'' was one of the smallest sauropods of the Morrison.〔 While some Morrison sauropods could reach lengths of over 20 meters (or over 70 feet), ''Haplocanthosaurus'' was smaller, reaching a total length of 14.8 meters (49 feet) and an estimated weight of 12.8 metric tons.〔Mazzetta, G.V., Christiansen, P. and Fariña, R.A. (2004). "Giants and Bizarres: Body size of some southern South American Cretaceous dinosaurs." ''Historical Biology'', 16(2): 71-83.〕
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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