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Eucoelophysis

Description

Eucoelophysis (meaning "true hollow form") is a genus of 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.


Source Data
SourceIDLink
Global Biodiversity Information Facility ID (GBIF)4821959https://www.gbif.org/species/4821959
PaleoBioDB ID (PBDB)68125https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=68125
Rankgenus
Taxonomy (GBIF)Life : Animalia : Chordata : Reptilia : Eucoelophysis
Taxonomy (PBDB)Life : Animalia : Chordata : Reptilia : Eosuchia : Silesauridae : Eucoelophysis
Taxonomic Status (GBIF)accepted
Classification
(PBDB,GBIF)
RankNameAuthor
-Eukaryota
-OpisthokontaCavalier-Smith 1987
kingdomAnimalia
-TriploblasticaLankester 1877
-NephrozoaJondelius et al. 2002
-DeuterostomiaGrobben 1908
phylumChordataHaeckel 1847
subphylumVertebrataLamarck 1801
superclassGnathostomataGegenbauer 1874
-Osteichthyes
-SarcopterygiiRomer 1955
subclassDipnotetrapodomorpha
subclassTetrapodomorpha
-Tetrapoda
-ReptiliomorphaSäve-Söderbergh 1934
-AnthracosauriaSäve-Söderbergh 1934
-Batrachosauria
-Cotylosauria
-AmniotaHaeckel 1866
-SauropsidaHuxley 1864
classReptiliaLaurenti 1768
subclassEureptilia
-RomeriidaGauthier et al. 1988
-Diapsida
-Eosuchia
-NeodiapsidaBenton 1985
-SauriaGauthier 1984
-Archosauromorpha
-CrocopodaEzcurra 2016
-ArchosauriformesGauthier 1986
-EucrocopodaEzcurra 2016
-Archosauria
informalAvemetatarsaliaBenton 1999
-OrnithodiraGauthier 1986
-DinosauromorphaBenton 1985
-DinosauriformesNovas 1992
-SilesauridaeLanger et al. 2010
-SulcimentisauriaMartz and Small 2019
genusEucoelophysisSullivan & Lucas 1999
Scientific NameEucoelophysis Sullivan & Lucas, 1999
Name Published InJ Vertebr Paleontol 19 (1), 15 March
Opinions (PBDB)
NameRankOpinionEvidenceAuthor
Eucoelophysisgenusbelongs to Ceratosauriastated without evidenceSullivan and Lucas, 1999
Eucoelophysisgenusnomen dubium Ceratosauriastated without evidenceTykoski and Rowe, 2004
Eucoelophysisgenusbelongs to Ornithodirastated without evidenceIrmis et al., 2005
Eucoelophysisgenusbelongs to Dinosauriformesstated without evidenceEzcurra, 2006
Eucoelophysisgenusbelongs to Ornithodirastated without evidenceNesbitt et al., 2007
Eucoelophysisgenusbelongs to Silesauridaestated with evidenceNesbitt et al., 2010
Eucoelophysisgenusbelongs to Silesauridaestated without evidenceGriffin and Nesbitt, 2016
Eucoelophysisgenusbelongs to Sulcimentisauriastated with evidenceMartz and Small, 2019
Status (PBDB)extinct
Taxon Size (PBDB)2
First Recorded Appearance228 - 209 Ma
Late/Upper Triassic
Last Recorded Appearance209 - 201 Ma
Mesozoic
Environmentterrestrial (based on Diapsida)
Motilityactively mobile (based on Osteichthyes)
Taphonomyphosphatic (based on Vertebrata)
Primary Reference (PBDB)R. M. Sullivan and S. G. 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
Wikipediahttps://en.wikipedia.org/wiki/Eucoelophysis

Fossil Distribution

Subtaxa

NameStatusCommon Name(s)Fossil OccurrencesOldestYoungest
Eucoelophysis baldwini
species
accepted (GBIF)
listed (PBDB)
1228 Ma
Late/Upper Triassic
228 Ma
Late/Upper Triassic

Synonymy List

YearName and Author
1999Eucoelophysis Sullivan and Lucas pp. 82-83 figs. 3-9, 10A-B
2005Eucoelophysis Irmis et al. p. 139
2006Eucoelophysis Ezcurra p. 651
2007Eucoelophysis Irmis et al. p. 361 fig. 3
2007Eucoelophysis Nesbitt et al. p. 211
2007Eucoelophysis Spielmann et al. p. 385
YearName and Author
2010Eucoelophysis Nesbitt et al. p. 97
2011Eucoelophysis Nesbitt fig. 52
2012Eucoelophysis Kammerer et al. pp. 281-282 fig. 4
2016Eucoelophysis Griffin and Nesbitt p. 8
2019Eucoelophysis Martz and Small p. 53

References

Sullivan R. M., 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
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
Irmis R. B., Nesbitt S. J., et al (2007) A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs, Science 317, 358-361
Nesbitt S. J., Irmis R. B., et al (2007) A critical re-evaluation of the Late Triassic dinosaur taxa of North America, Journal of Systematic Palaeontology 5 2, 209-243
Spielmann J. A., Lucas S. G., et al (2007) Oldest records of the Late Triassic theropod dinosaur Coelophysis bauri, In S. G. Lucas & J. A. Spielmann (eds.), The Global Triassic. New Mexico Museum of Natural History and Science Bulletin 41, 384-401
Nesbitt S. J., Sidor C. A., et al (2010) Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira, Nature 464, 95-98 doi:10.1038/nature08718
Nesbitt S. J. (2011) The early evolution of archosaurs: relationships and the origin of major clades, Bulletin of the American Museum of Natural History 353, 1-292
Kammerer C. F., Nesbitt S. J., et al (2012) The first basal dinosauriform (Silesauridae) from the Late Triassic of Morocco, Acta Palaeontologica Polonica 57 2, 277-284 doi:10.4202/app.2011.0015
Griffin C. T., Nesbitt S. J. (2016) The femoral ontogeny and long bone histology of the Middle Triassic (?late Anisian) dinosauriform Asilisaurus kongwe and implications for the growth of early dinosaurs, Journal of Vertebrate Paleontology 36 3, e1111224:1-22 doi:10.1080/02724634.2016.1111224
Martz J. W., Small B. J. (2019) Non-dinosaurian dinosauromorphs from the Chinle Formation (Upper Triassic) of the Eagle Basin, northern Colorado: Dromomeron romeri (Lagerpetidae) and a new taxon, Kwanasaurus williamparkeri (Silesauridae), PeerJ 7, e7551:1-71 doi:10.7717/peerj.7551
Nomenclator Zoologicus. A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus supplementary digital-only volume. http://ubio.org/NomenclatorZoologicus (as at 2006). - via The Interim Register of Marine and Nonmarine Genera
J Vertebr Paleontol 19 (1), 15 March - via The Interim Register of Marine and Nonmarine Genera
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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