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Eucoelophysis : ウィキペディア英語版
Eucoelophysis

''Eucoelophysis'' (meaning "true hollow form") is a genus of dinosauriform from the Late Triassic (Norian) period Chinle Formation of New Mexico. It was assumed to be a coelophysid upon description,〔Sullivan, R.M. and Lucas, S.G. (1999). "''Eucoelophysis baldwini'', a new theropod dinosaur from the Upper Triassic of New Mexico, and the status of the original types of Coelophysis". ''Journal of Vertebrate Paleontology'' 19(1): 81-90.〕 but a study by Nesbitt ''et al.'' found that it was actually a close relative of ''Silesaurus'',〔Nesbitt, S.J., Irmis, R.B., and Parker, W.G. (2005). "A critical review of the Triassic North American dinosaur record." In Kellner, A.W.A., Henriques, D.D.R., & Rodrigues, T. (eds.), ''II Congresso Latino-Americano de Paleontologia de Vertebrados, Boletim de Resumos.'' Rio de Janeiro: Museum Nacional/UFRJ, 139.〕〔Nesbitt, S. J., R. B. Irmis, and W. G. Parker. (2007). "A critical re-evaluation of the Late Triassic dinosaur taxa of North America." ''Journal of Systematic Palaeontology'', 5:209-243.〕 which was independently supported by Ezcurra (2006), who found it to be the sister group to Dinosauria, and ''Silesaurus'' as the next most basal taxon.〔Ezcurra, M.D. (2006). "A review of the systematic position of the dinosauriform archosaur ''Eucoelophysis baldwini'' Sullivan & Lucas, 1999 from the Upper Triassic of New Mexico, USA." ''Geodiversitas'', 28(4):649-684.〕
However, the relationships of ''Silesaurus'' are uncertain. Dzik found it to be a dinosauriform (the group of archosaurs from which the dinosaurs evolved), but did not rule out the possibility that it represents a primitive ornithischian.〔Dzik, J. (2003). "A beaked herbivorous archosaur with dinosaur affinities from the early Late Triassic of Poland." ''Journal of Vertebrate Paleontology'', 23(3): 556-574.〕
==References==


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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