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Dilong paradoxus

Reptilia - Avetheropoda

Taxonomy
Dilong paradoxus was named by Xu et al. (2004). Its type specimen is IVPP V.14243. Its type locality is Lujiatun village 2, Yixian (IVPP), which is in a Barremian/Aptian fluvial-lacustrine sandstone in the Yixian Formation of China. It is the type species of Dilong. It was considered monophyletic by Xu et al. (2004).

Synonymy list
YearName and author
2004Dilong paradoxus Xu et al. p. 680 figs. 1-3
2007Dilong paradoxus Naish and Martill p. 504
2009Dilong paradoxus Xing et al. p. 709
2009Dilong paradoxus Zanno et al. p. S15
2010Dilong paradoxus Chiappe and Göhlich p. 265
2011Dilong paradoxus Hone et al. p. 501
2017Dilong paradoxus Carr et al. p. 9s

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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()
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
suborderCoelurosauria
superfamilyTyrannosauroidea
genusDilong
speciesparadoxus

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. Xu et al. 2004A small tyrannosauroid distinguishable from other tyrannosauroids by the unique presence of two large pneumatic recesses dorsal to the antorbital fossa on the maxilla, a Y-shaped crest formed by the nasals and lacrimals, an extremely long descending process of the squamosal extending close to the mandibular articulation of the quadrate, a lateral projection of the basisphenoid anterior to the basal tuber, very deep, sub-circular interspinous ligamentous fossae on cervical vertebrae, robust scapula with a wide distal end (distal end twice as wide as the proximal scapular blade) and a hypertrophied coracoid (dorsoventral length about 70% of the scapular length).