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Psittacosaurus lujiatunensis

Reptilia

Discussion

Recorded measurements are for adult or near-adult specimens only (age nine or more). Numerous juvenile specimens were also measured by Erickson et al. (2009).

Taxonomy
Psittacosaurus lujiatunensis was named by Zhou et al. (2006). Its type specimen is ZMNH M8137, a skull, and it is a 3D body fossil. Its type locality is Lujiatun village 3, Yixian (ZMNH), which is in a Barremian/Aptian fluvial-lacustrine horizon in the Yixian Formation of China.

Synonyms
Synonymy list
YearName and author
2003Hongshanosaurus houi You et al.
2006Psittacosaurus lujiatunensis Zhou et al. p. 101 figs. 2-6
2007Psittacosaurus major Sereno et al. pp. 275-276 figs. 1-3
2007Psittacosaurus lujiatunensis Zhao et al. p. 1025
2008Psittacosaurus lujiatunensis You et al. p. 183
2008Psittacosaurus major You et al. p. 183
2009Psittacosaurus lujiatunensis Erickson et al. p. 1515
2009Psittacosaurus lujiatunensis Tanoue et al. p. 428
2009Psittacosaurus major Tanoue et al. p. 428
2009Hongshanosaurus houi Tanoue et al. p. 430
2010Psittacosaurus lujiatunensis Sereno p. 28
2010Psittacosaurus major Sereno p. 28
2010Psittacosaurus major Sereno et al. p. 201
2010Psittacosaurus lujiatunensis Sereno et al. p. 202
2010Psittacosaurus lujiatunensis Zhou et al. p. 464
2013Psittacosaurus lujiatunensis Hedrick and Dodson p. 9
2014Psittacosaurus lujiatunensis Hedrick et al. p. 322
2015Psittacosaurus lujiatunensis Han et al. p. 2
2015Psittacosaurus lujiatunensis Zheng et al. p. 5
2020Psittacosaurus lujiatunensis Dieudonné et al.
2020Psittacosaurus major Dieudonné et al.
2020Psittacosaurus lujiatunensis Sakagami and Kawabe p. 1
2020Psittacosaurus lujiatunensis Yang et al. p. 2
2022Psittacosaurus lujiatunensis Son et al. p. 20

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

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.

Psittacosaurus lujiatunensis Zhou et al. 2006
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Invalid names: Psittacosaurus houi You et al. 2003 [synonym], Psittacosaurus major Sereno et al. 2007 [synonym]
Diagnosis
ReferenceDiagnosis
P. C. Sereno et al. 2007 (Psittacosaurus major)Psittacosaurid with a large skull relative to its postcranial skeleton (30% larger than Psittacosaurus mongoliensis and most other species); transversely narrow dorsal skull roof as a result of the narrowest proportions of the nasals and frontals among psittacosaur species; the most prominent dentary flanges of any psittacosaur species with a depth approximately one-third that of the mandibular ramus; ventrolaterally projecting jugal horn; absence (closure) of the external mandibular fenestra as in Psittacosaurus sinensis and P. neimongoliensis; seven sacral vertebrae (one dorsosacral added with rib attachment to the distal end of the preacetabular process), one more than in other psittacosaur species.