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Sinornithosaurus haoiana

Reptilia - Avetheropoda - Dromaeosauridae

Taxonomy
Sinornithosaurus haoiana was named by Liu et al. (2004). Its type specimen is D2140, a skeleton, and it is a compression fossil. Its type locality is Baicaigou, Toutai, which is in an Aptian lacustrine shale/mudstone in the Yixian Formation of China.

Synonymy list
YearName and author
2004Sinornithosaurus haoiana Liu et al. pp. 778-779
2009Sinornithosaurus haoiana Zheng et al.
2012Sinornithosaurus haoiana Dececchi et al. p. 134

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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()
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
suborderCoelurosauria
Maniraptoriformes
familyDromaeosauridae
genusSinornithosaurus
specieshaoiana

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
J. Liu et al. 2004It can be distinguished from S. millenii in that: (1) the main body of the premaxilla is higher, its length being slightly longer than its height; (2) the anterior margin of the premaxilla is vertical; (3) the maxillary process of the premaxilla is very lon; (4) the maxilla is separated from external naris; (5) maxillary fenestra is circular and relatively small; (6) the ascending process ofquadratojugal is remarkably longer than the jugal process; (7) the ratio of the dentary length/height is distinctly small; and (8) the pubic peduncle of ilium is longitudinally narrower than acetabulum and so on.