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Monolophosaurus jiangi

Reptilia - Avetheropoda

Taxonomy
Monolophosaurus jiangi was named by Zhao and Currie (1994). Its type specimen is IVPP 84019, a partial skeleton, and it is a 3D body fossil. Its type locality is Jiangjunmiao theropod (CCDP), which is in a Callovian terrestrial sandstone in the Shishugou Formation of China. It was considered monophyletic by Currie (2000).

Synonyms
Synonymy list
YearName and author
1992Monolophosaurus jiangjunmiaoi Dong
1994Monolophosaurus jiangi Zhao and Currie p. 2028 figs. 1-5
1997Monolophosaurus jianji Vickaryous and Ryan p. 488
1999Monolophosaurus jiangi Knoll et al. p. 106
2000Monolophosaurus jiangi Currie p. 434
2001Monolophosaurus jiangi Dong p. 98
2003Monolophosaurus jiangi Rauhut p. 20
2004Monolophosaurus jiangi Holtz, Jr. et al. p. 74
2007Monolophosaurus jiangi Sampson and Witmer p. 38
2008Monolophosaurus jiangi Watabe et al. p. 35
2010Monolophosaurus jiangi Choiniere et al. p. 1773
2010Monolophosaurus jiangi Zhao et al.
2011Monolophosaurus jiangi Jasinski p. 198
2012Monolophosaurus jiangi Carrano et al. p. 237

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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()
RankNameAuthor
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
superfamilyAllosauroidea
genusMonolophosaurus
speciesjiangi

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
X.-J. Zhao et al. 2010Skull with midline crest (formed by the paired premaxillary, nasal, lacrimal, and frontal bones) extending above exxternal naris to a point between orbits. Long, low external naris, and anteroposteriorly elongate premaxilla. Antorbital sinuses in nasals confluent through openings in base of crest
M. T. Carrano et al. 2012Tetanuran with: (1) nasal process of premaxilla bifurcated posteriorly (Brusatte et al. 2010a); (2) lateral surface of premaxilla with deep groove between subnarial foramen and foramen on base of nasal process (Brusatte et al. 2010a); (3) large midline crest formed by nasals with straight dorsal margin nearly parallel to maxillary alveolar margin (modified from Zhao & Currie 1994); (4) two enlarged, subequal pneumatic fenestrae in posterodorsal part of narial fossa (Brusatte et al. 2010a); (5) lacrimal with discrete, tab-like process projecting dorsally above preorbital bar (Brusatte et al. 2010a); and (6) rectangular frontals, much wider than long (width/length = 1.67) (Brusatte et al. 2010a).