Eucoelophysis (meaning "true hollow form") is a genus of dinosauriform from the Late Triassic (Norian) period of New Mexico. It was assumed to be a coelophysid upon description, but a 2005 study by Nesbitt et al. found that it was actually a close relative of Silesaurus, 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.
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