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Eucoelophysis

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Eucoelophysis Temporal range: Late Triassic, 228–208 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Family:	†Silesauridae
Clade:	†Sulcimentisauria
Genus:	†Eucoelophysis
Species:	†E. baldwini
Binomial name
†Eucoelophysis baldwini Sullivan & Lucas, 1999

Eucoelophysis (meaning "true hollow form") is a genusofsilesaurid dinosauriform from the Late Triassic (Norian) period Chinle FormationofNew Mexico. It was assumed to be a coelophysid upon description,^[1] but a study by Nesbitt et al. found that it was actually a close relative of Silesaurus,^[2]^[3] which was independently supported by Ezcurra (2006), who found it to be the sister grouptoDinosauria, and Silesaurus as the next most basal taxon.^[4]

However, the relationships of Silesaurus are uncertain. Dzik found it to be a basal dinosauriform (the group of archosaurs from which the dinosaurs evolved), but did not rule out the possibility that it represents a primitive ornithischian.^[5]

References[edit]

^ 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.

^ 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.

^ 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.

^ 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.