Back Eucoelophysis Spanish Eucoelophysis French Eucoelophysis baldwini Italian エウコエロフィシス Japanese Eucoelophysis Dutch Eucelofyz Polish Eucoelophysis Vietnamese 真腔骨龍屬 Chinese
| Eucoelophysis Temporal range: Late Triassic,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Family: | †Silesauridae |
| Clade: | †Sulcimentisauria |
| Genus: | †Eucoelophysis |
| Species: | †E. baldwini
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| Binomial name | |
| †Eucoelophysis baldwini Sullivan & Lucas, 1999
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Eucoelophysis (meaning "true hollow form") is a genus of silesaurid dinosauriform from the Late Triassic (Norian) period Chinle Formation of New 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 group to Dinosauria, 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]
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