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Sinraptor hepingensis

Reptilia - Avetheropoda - Metriacanthosauridae

Taxonomy
Yangchuanosaurus hepingensis was named by Gao (1992). Its type specimen is ZDM 0024, a skeleton, and it is a 3D body fossil. Its type locality is Tianwan village, Heping, which is in an Oxfordian terrestrial mudstone in the Shangshaximiao Formation of China.

It was recombined as Sinraptor hepingensis by Currie and Zhao (1994), Dong (1997), Rauhut (2003), Holtz et al. (2004), Wu et al. (2009) and Carrano et al. (2012).

Synonymy list
YearName and author
1992Yangchuanosaurus hepingensis Gao
1994Sinraptor hepingensis Currie and Zhao p. 2039
1997Sinraptor hepingensis Dong p. 122
1999Yangchuanosaurus hepingensis Gao
2003Sinraptor hepingensis Rauhut p. 27
2004Sinraptor hepingensis Holtz, Jr. et al. p. 74
2008Yangchuanosaurus hepingensis Watabe et al. p. 35
2009Sinraptor hepingensis Wu et al. pp. 18-19
2009Yangchuanosaurus hepingensis Xing et al. p. 1391
2012Sinraptor hepingensis Carrano et al. pp. 245, 248

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
superfamilyAllosauroidea
familyMetriacanthosauridae
subfamilyMetriacanthosaurinae
genusSinraptor
specieshepingensis()

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
Y. Gao 1992Body large, reaching 8 m In length. Skull robust, facial portion low, long, with ratio of skull length/height 1.75. Two antorbital fenestrae; first antorbital fenestra well-developed, elongated in anteroposterior direction, forming isosceles triangle; second antorbital fenestra small, rectangular in outline. Maxillary depression long, elliptical. Parietal strongly pronounced, with well-developed posterior process. Supraoccipital narrow, with well-developed median ridge. Lacrimal tilted anteriorly, coming into contact with postorbital at dorsal edge of orbit. Dentary thick, strong, relatively high. Teeth relatively small. Premaxillary and maxillary teeth with thin crown; dental formula Pm4M13-14/D16.
9 cervical vertebrae, opisthocoelous; posteriorly-located cervical vertebrae bearing ventral
ridge. 14 dorsal vertebrae, with relatively short, amphiplatyan centra and high, flat neural spines. 5 sacral vertebrae fused together. Caudal vertebrae amphicoelous, with long prezygapophyses in middle and posterior vertebrae. Scapular shaft wide. Ilium high, with anterior lobe curved ventrally. Pubic foramen small, and pubic foot short, broad. Ischium expanded distally.
M. T. Carrano et al. 2012As with Yangchuanosaurus shangyouensis (q.v.), it is not clear whether ‘Yangchuanosaurus’ hepingensis possesses autapomorphies or can only be distinguished by a unique combination of characters (see Remarks, below).