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Yunnanosaurus huangi

Reptilia -

Taxonomy
Yunnanosaurus huangi was named by Young (1940). Its type specimen is IVPP AS V.20 (NGMJ 004546), a skeleton, and it is a 3D body fossil. Its type locality is Huangchiatien, Lufeng, which is in a Sinemurian terrestrial horizon in the Lufeng Formation of China.

It was synonymized subjectively with Lufengosaurus huenei by Rozhdestvensky (1965) and Galton and Cluver (1976).

Synonymy list
YearName and author
1940Yunnanosaurus huangi Young
1941Yunnanosaurus huangi Bien p. 174
1942Yunnanosaurus huangi Young p. 64 figs. 1-17
1944Yunnanosaurus huangi Young p. 4
1946Yunnanosaurus huangi Young p. 5
1947Yunnanosaurus huangi Young p. 25
1961Yunnanosaurus huangi Hu pp. 279-280
1965Yunnanosaurus huangi Simmons p. 63
1970Yunnanosaurus huangi Steel p. 52
1992Yunnanosaurus huangi Dong p. 163
2003Yunnanosaurus huangi Yates p. 318
2004Yunnanosaurus huangi Galton and Upchurch p. 236
2007Yunnanosaurus huangi Barrett et al. p. 321
2007Yunnanosaurus huangi Galton p. 518
2007Yunnanosaurus huangi Lu et al. p. 1
2007Yunnanosaurus huangi Upchurch et al. p. 76
2009Yunnanosaurus huangi Xing et al. p. 17
2010Yunnanosaurus huangi Langer et al. p. 90
2011Yunnanosaurus huangi Apaldetti et al. p. 4
2012Yunnanosaurus huangi Barrett and Xu p. 156

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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
RankNameAuthor
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Eusaurischia
Sauropodomorpha(Huene 1932)
Massopoda
Sauropodiformes
genusYunnanosaurus
specieshuangi

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. M. Barrett et al. 2007(cranial features only): Small external naris (∼10% of maximum skull length); robust, rostrocaudally expanded nasal process of the premaxilla; presence of a ventral projection from the caudal margin of ascending maxillary process; lack of nutritive foramina on lateral surface of maxilla; shallow, subcircular fossa present on lateral surface of ventral lachrymal process; presence of a midline boss near to the rostral end of the frontals; prominent midline boss present on the parietals; rostrolateral process of the parietal rostrocaudally expanded relative to the width of the caudolateral process; maxillary teeth are mesiodistally narrow and lack denticles.