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