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Phylogeny of Eucoelophysis and Silesaurus
Although Dzik (2003) described Silesaurus as a dinosauriform possibly related to dinosaurs, two alternate proposals were offered: that either Silesaurus is an early ornithischian or that it is represents a sauropodomorph-ornithischian link. Eucoelophysis may also be a basal plant-eating dinosaur.
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.
Clarification of Eucoelophysis article
The holotype of Eucoelophyis baldwini is NMMNH P-22298, with six more specimens (AMNH 2729, 2736, 2738, 2739, 2749, 2751) definitely referrable. The original types of Coelophysis were thought to be possibly referrable to Eucoelophysis, but the authors who described Eucoelophysis could not assign the original Coelophysis types to the latter genus due to their poor nature (Sullivan and Lucas, 1999). Given the fact that Eucoelophysis is not a theropod, but a relative of Silesaurus, the original remains of Coelophysis are not referrable to Eucoelophysis (Nesbitt et. al., 2005).
Sullivan and Lucas (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.
R. B. Irmis, S. J. Nesbitt, and W. G. Parker. (2005). A critical review of the Triassic North American dinosaur record. In A. W. A. Kellner, D. D. R. Henriques, & T. Rodrigues (eds.), II Congresso Latino-Americano de Paleontologia de Vertebrados, Boletim de Resumos. Museum Nacional/UFRJ, Rio de Janeiro 139.