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