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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
Clade:	Dinosauria (?)
Clade:	†Ornithischia (?)
Family:	†Silesauridae
Clade:	†Sulcimentisauria
Genus:	†Eucoelophysis
Species:	†E. baldwini
Binomial name
†Eucoelophysis baldwini Sullivan & Lucas, 1999

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, but a 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.

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.

References

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.

External links

• William Parker's reaction to Ezcurra (2006) Archived 2016-03-03 at the Wayback Machine, from the Dinosaur Mailing List.

v t e Avemetatarsalia / Pan-Aves
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Archosauria Sauropsida see Sauropsida Archosauromorpha see Archosauromorpha Avemetatarsalia see below↓ Avemetatarsalia
Avemetatarsalia †Incertovenator? †Mambachiton †Aphanosauria Incertovenator? Dongusuchus Spondylosoma Teleocrater Yarasuchus Ornithodira †Pterosauromorpha Lagerpetidae Dromomeron Faxinalipterus? Ixalerpeton Kongonaphon Lagerpeton Scleromochlus? Venetoraptor Pterosauria see Pterosauria Dinosauromorpha †Lagosuchus †Marasuchus †Nyasasaurus? †Saltopus †Silesauridae? Agnosphitys Asilisaurus Lewisuchus Pisanosaurus? Soumyasaurus Technosaurus? Sulcimentisauria Amanasaurus Diodorus Eucoelophysis Gamatavus Gondwanax Ignotosaurus Kwanasaurus Lutungutali Sacisaurus Silesaurus Dinosauria †Ornithischia see Ornithischia Saurischia †Alwalkeria †Chindesaurus †Daemonosaurus †Eodromaeus †Saltopus? †Tawa †Herrerasauria Chindesaurus? Daemonosaurus? Tawa? Caseosaurus? Herrerasauridae Gnathovorax Herrerasaurus Sanjuansaurus Staurikosaurus Eusaurischia †Sauropodomorpha see Sauropodomorpha Theropoda see Theropoda includes birds
See also: Ornithoscelida Phytodinosauria Category

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• Silesaurids
• Late Triassic archosaurs of North America
• Taxa named by Spencer G. Lucas
• Fossil taxa described in 1999
• Prehistoric archosaur stubs