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Wannanosaurus yansiensis

Reptilia

Taxonomy
Wannanosaurus yansiensis was named by Hou (1977). Its type specimen is IVPP V4447, a partial skeleton, and it is a 3D body fossil. Its type locality is Yansi, Jingxian (IVPP), which is in a Maastrichtian terrestrial sandstone in the Xiaoyan Formation of China.

Synonymy list
YearName and author
1977Wannanosaurus yansiensis Hou
1982Wannanosaurus yansiensis Perle et al. p. 121
1986Wannanosaurus yansiensis Zhao p. 72
1990Wannanosaurus yansiensis Maryanska p. 566
1992Wannanosaurus yansiensis Dong p. 166
1994Wannanosaurus yansiensis Olshevsky and Ford p. 91
1997Wannanosaurus yansiensis Sues p. 512
1998Wannanosaurus yansiensis Yu p. 279
1999Wannanosaurus yansiensis Yu p. 96
2000Wannanosaurus yansiensis Sereno p. 482
2003Wannanosaurus yansiensis Williamson and Carr fig. 11
2004Wannanosaurus yansiensis Maryanska et al. p. 465
2006Wannanosaurus yansiensis Sullivan p. 359
2008Wannanosaurus yansiensis Butler et al. p. 11
2009Wannanosaurus yansiensis Butler and Sullivan p. 29
2009Wannanosaurus yansiensis Butler and Zhao p. 69
2009Wannanosaurus yansiensis Williamson et al. p. 292
2010Wannanosaurus yansiensis Longrich et al. p. 280
2012Wannanosaurus yansiensis Han et al. p. 1391 fig. 14
2014Wannanosaurus yansiensis Xing et al. p. 191
2016Wannanosaurus yansiensis Becerra et al. p. 564
2018Wannanosaurus yansiensis Evans et al. p. 121
2020Wannanosaurus yansiensis Dieudonné et al.
2020Wannanosaurus yansiensis Yang et al. p. 4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Marginocephalia
—Pachycephalosauria()
genusWannanosaurus
speciesyansiensis

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.

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Diagnosis
ReferenceDiagnosis
R. J. Butler et al. 2008Extreme flexure of the humerus, with proximal and distal ends set at approximately 30° to one another.
R. J. Butler and Q. Zhao 2009Pachycephalosaur distinguished by the extreme flexure of the humerus in anterior/posterior and lateral views. In anterior/posterior view, the humerus is flexed strongly laterally along its length, and the proximal and distal ends are set at approximately 30 degrees to one another (Sereno, 2000). In lateral view the proximal end of the humeral shaft is flexed strongly posteriorly, at an angle of around 50 degrees to the distal shaft.