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Jinzhousaurus yangi

Reptilia - Iguanodontidae

Taxonomy
Jinzhousaurus yangi was named by Wang and Xu (2001). Its type specimen is IVPP V12691, a skeleton (nearly complete skeleton with a complete skull), and it is a compression fossil. Its type locality is Baicaigou, Toutai, which is in a Barremian/Aptian lacustrine shale/mudstone in the Yixian Formation of China. It was considered monophyletic by Wang and Xu (2001).

Synonymy list
YearName and author
2001Jinzhousaurus yangi Wang and Xu p. 1669 figs. 1-2
2004Jinzhousaurus yangi Norman p. 416
2005Jinzhousaurus yangi Buffetaut et al. p. 578
2006Jinzhousaurus yangi Buffetaut et al. p. 30
2007Jinzhousaurus yangi Gilpin et al. p. 80
2008Jinzhousaurus yangi Chen et al. p. 310
2008Jinzhousaurus yangi Paul pp. 199-200
2009Jinzhousaurus yangi Barrett et al. p. 36
2010Jinzhousaurus yangi Amiot et al. p. 354
2010Jinzhousaurus yangi Carpenter and Ishida p. 151
2010Jinzhousaurus yangi McDonald et al. p. 33 fig. 39
2010Jinzhousaurus yangi McDonald et al. p. 808 fig. 10
2010Jinzhousaurus yangi Prieto-Márquez p. 5 fig. 2
2010Jinzhousaurus yangi Prieto-Márquez and Norell p. 6
2010Jinzhousaurus yangi Wu et al. p. 127
2011Jinzhousaurus yangi Prieto-Márquez p. 774
2011Jinzhousaurus yangi Wang et al. p. 136
2012Jinzhousaurus yangi Ramírez-Velasco et al. p. 391
2012Jinzhousaurus yangi Xing et al. p. 166
2013Jinzhousaurus yangi Yang et al. p. 275
2013Jinzhousaurus yangi Zheng et al.
2014Jinzhousaurus yangi McDonald et al. p. 44
2014Jinzhousaurus yangi Tsogtbaatar et al. p. 115
2016Jinzhousaurus yangi Fuentes Vidarte et al. p. 435
2018Jinzhousaurus yangi Gates et al. p. 2
2019Jinzhousaurus yangi Bell et al. p. 4
2019Jinzhousaurus yangi Ibiricu et al. p. 280
2021Jinzhousaurus yangi McDonald et al. p. 9
2022Jinzhousaurus yangi Ji and Zhang p. 2

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
RankNameAuthor
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Genasauria
Cerapoda
Ornithopoda()
Clypeodonta
Iguanodontia()
Dryomorpha
Ankylopollexia
Neoiguanodontia
familyIguanodontidae
genusJinzhousaurus
speciesyangi

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.

Jinzhousaurus yangi Wang and Xu 2001
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Diagnosis
ReferenceDiagnosis
X. Wang and X. Xu 2001Large-sized Iguanodontid dinosaur, about 7 m in total length. The skull is about 500 mm in length and 280 mm in height. The antorbital portion is long, accounting for 64% the skull length. The maxilla is triangular in lateral view and has a long, narrow rostral extension. The antorbital fenestra is absent. The frontals are fused into one element. The frontals extend quite anteriorly, close to the anterior border of the orbit and do not contribute to the formation of the orbit. The quadrate has a curved shaft. The supratemporal foramen is pointed forward outsides. The quadtatojugal is large. The ventral process of the predentary is very weakly bifurcated. The dorsal and ventral margins of the dentary are straight. There are more than 16 dentary teeth that become larger posteriorly.
G. S. Paul 2008Premaxillary tip to anterior orbital rim/latter to paraoccipital process tip length ratio w1.25; dentary pre-coronoid process length/minimum depth ratio under 5. Rostrum subtriangular in lateral view. Premaxilla projects well below level of tooth rows, maxillary process is moderately deep. Dorsal apex of maxilla set posteriorly. Antorbital fossa and fenestra reduced. Lacrimal short, contacts nasal. Frontals *do not participate in orbital rim. Lateral temporal fenestra small. Posterior portion of jugal short. Quadratojugal short. Quadrate moderately tall, shaft curved, dorso-posterior buttress small. Squamosals *contact one another. Diastema absent. Tooth position numbers low.
P. M. Barrett et al. 2009(cranial features only).—Differs from all other iguanodontoid taxa in possessing the following features: lachrymal reduced in size with a sub−triangular outline; nasals terminate in a pointed, sub−triangular caudal process that overlaps the frontals; frontals fused; frontal unit with a “T”−shaped outline in dorsal view and prominent, distinct postorbital processes that are offset from the main body of the bone; laterodorsal surface of the frontal bears an elongate shallow depression.
X. Wang et al. 2011Differs from all other non-hadrosaurid iguanodontians in possessing the following autapomorphies: large shallow fossa present on the anterior part of the maxilla adjacent to the premaxillary junction; lachrimal reduced in size with a sub-triangular outline; nasals terminate in a pointed, sub-triangular posterior process that overlaps the frontals; frontal unit with a ‘T’-shaped outline in dorsal view and prominent, distinct postorbital processes that are offset from the main body of the bone; laterodorsal surface of the frontal bears an elongate shallow depression; predentary with unilobate midline process that expands in transverse width distally; sternal bears a well-developed, posteriorly positioned, tab-like midline process that forms an angle of approximately 80 degrees with the posterolateral process; manual phalanx III-1 is broader than long and less than 20% the length of metacarpal III (modified from Barrett et al. 2009).