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Eoraptor lunensis

Reptilia -

Taxonomy
Eoraptor lunensis was named by Sereno et al. (1993). Its type specimen is PVSJ 512. Its type locality is northeast edge, Cancha de Bochas, which is in a Carnian terrestrial siltstone in the Ischigualasto Formation of Argentina. It is the type species of Eoraptor.

Synonymy list
YearName and author
1993Eoraptor lunensis Sereno et al. pp. 64-66 figs. 1-2
1997Eoraptor lunensis Novas p. 303
1997Eoraptor lunensis Ryan and Vickaryous p. 169
2003Eoraptor lunensis Langer p. 1
2003Eoraptor lunensis Rauhut p. 13
2004Eoraptor lunensis Langer p. 27
2005Eoraptor lunensis Yates p. 117
2006Eoraptor lunensis Langer and Benton p. 311
2006Eoraptor lunensis Thulborn p. 288
2007Eoraptor lunensis Sampson and Witmer p. 38
2007Eoraptor lunensis Upchurch et al. p. 75
2009Eoraptor lunensis Martínez and Alcober p. 2
2010Eoraptor lunensis Alcober and Martínez p. 57
2010Eoraptor lunensis Langer et al. p. 62
2011Eoraptor lunensis Apaldetti et al. p. 4
2011Eoraptor lunensis Sues et al. p. 3460
2013Eoraptor lunensis Sereno et al. p. 93–94

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Eusaurischia
Sauropodomorpha(Huene 1932)
genusEoraptor
specieslunensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
P. C. Sereno et al. 2013Small basal sauropodomorph with the following autapomorphies: premaxilla posterolateral process slender with tongue-shaped distal expansion; nasal with transversely broad, horizontal shelf with a convex lateral margin that overhangs the antorbital fossa; pterygoid process on posterior palate margin that articulates laterally in a synovial socket in the ectopterygoid; narrow premaxilla-maxilla diastema approximately one crown in width; maxillary crowns with a prominent lateral eminence; accessory articular process on the medial aspect of midcervical prezygapophyses; extreme hollowing of dorsal centra and neural arches.
Eoraptor lunensis can be differentiated from Panphagia protos by its shallow neurovascular groove on the lateral aspect of the dentary, less pronounced ridge on the lateral aspect of the surangular, less expanded distal scapular blade (approximately twice neck width), more perpendicular distal border on scapular bade, longer pubic blades (more than four times distal blade width), tibial cnemial crest and opposing proximal condyles more anteroposteriorly expanded, tibial distal end more transversely expanded, and the ascending process and posterior fossa on the astragalus much broader transversely (approximately one-third the width of the astragalus).
Eoraptor lunensis can be differentiated from Chromogisaurus novasi by the more strongly inturned femoral head, the markedly asymmetrical shape of the fourth trochanter, the tibial cnemial crest and opposing proximal condyles more anteroposteriorly expanded, and the tibial distal end more transversely expanded. Several of these points of distinction may have been influenced by weathering or crushing in Chromogisaurus novasi, which is not as well preserved as material pertaining to Eoraptor lunensis.