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Equijubus normani

Reptilia

Taxonomy
Equijubus normani was named by You et al. (2003). Its type specimen is IVPP V.12534, a partial skeleton, and it is a 3D body fossil. Its type locality is Equijubus type, Mazongshan, which is in an Albian terrestrial siliciclastic in the Zhonggou Formation of China.

Synonymy list
YearName and author
2003Equijubus normani You et al. p. 348 figs. 1-2
2004Equijubus normani Norman p. 415
2005Equijubus normani Buffetaut et al. p. 578
2006Equijubus normani Buffetaut et al. p. 30
2006Equijubus normani Lund and Gates p. 272
2008Equijubus normani Chen et al. p. 310
2008Equijubus normani Paul p. 201
2009Equijubus normani Barrett et al. p. 35
2009Equijubus normani Galton p. 215
2010Equijubus normani Amiot et al. p. 354
2010Equijubus normani Carpenter and Ishida p. 148
2010Equijubus normani McDonald et al. p. 33 fig. 39
2010Equijubus normani McDonald et al. p. 808 fig. 10
2010Equijubus normani Prieto-Marquez and Salinas p. 835 fig. 20
2010Equijubus normani Prieto-Márquez p. 5 fig. 2
2010Equijubus normani Prieto-Márquez and Norell p. 6
2010Equijubus normani Prieto-Márquez and Wagner p. 1243 fig. 3
2010Equijubus normani Wu et al. p. 127
2010Equijubus normani You et al. p. 59
2011Equijubus normani Prieto-Márquez p. 774
2011Equijubus normani Wang et al. p. 135
2012Equijubus normani Averianov and Alifanov p. 519
2012Equijubus normani Ramírez-Velasco et al. p. 391
2013Equijubus normani Yang et al. p. 275
2013Equijubus normani Zheng et al.
2014Equijubus normani McDonald et al. p. 46
2014Equijubus normani Tsogtbaatar et al. p. 116
2014Equijubus normani Xing et al. p. 1820
2014Equijubus normani You et al. p. 73
2015Equijubus normani Tan et al. p. 245
2015Equijubus normani Verdú et al. p. 254
2016Equijubus normani Fuentes Vidarte et al. p. 435
2016Equijubus normani Kim et al. p. 13
2016Equijubus normani Mori et al. p. 25
2016Equijubus normani Prieto-Márquez et al. p. 14
2017Equijubus normani Cruzado-Caballero and Powell p. 12 fig. 13
2018Equijubus normani Gates et al. p. 5
2018Equijubus normani Wu et al. p. 722
2019Equijubus normani You et al. p. 3
2022Equijubus normani 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
—Styracosterna
—Hadrosauriformes
—Hadrosauroidea()
genusEquijubus
speciesnormani

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.

†Equijubus normani You et al. 2003
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Diagnosis
ReferenceDiagnosis
H.-L. You et al. 2003Equijubus normani is characterized by a unique, finger-like process extending dorsally from the rostral process of the jugal to the lacrimal, and a very large lower temporal fenestra. Distinguished from non-hadrosauroid iguanodontians in having a long lacrimal with a rostroventral process positioned above the dorsal margin of the maxilla. Distinguished from other hadrosauroids in lacking the median primary ridge on the crown of the dentary teeth.
G. S. Paul 2008Premaxillary tip to anterior orbital rim/latter to paraoccipital process tip length ratio ~1.0; dentary pre-coronoid process length/minimum depth ratio under 4. Premaxilla projects well below level of tooth rows, maxillary process is shallow. Dorsal apex of maxilla sited anteriorly. Antorbital fossa small. Lacrimal long, does not contact nasal, *anterior process wedges between premaxilla and maxilla, *ventral edge at level of dorsal edge of maxilla. *Primary palpebral absent. Lateral temporal fenestra large. Anterior prong of jugal long and slender, *dorsal finger projects in lacrimal, posterior portion long. Quadratojugal tall. Quadrate tall, shaft nearly straight, lateral foramen set moderately low, dorso-posterior buttress small. Diastema long. Tooth positions 23 in maxilla, incipient 3rd row in many positions, battery tightly packed. Posterior dorsal centra compressed anteroposteriorly. 6 fused sacrals. Main body of ilium deep.
A. T. McDonald et al. 2014For genus and species by monotypy. Characters derived from the original diagnosis of You, Luo, et al. (2003) are marked with an asterisk (*). Basal hadrosauroid characterized by four autapomorphies: (1), rostrodorsally curved finger-like process that arises from the maxillary process of the jugal at the jugal-lacrimal contact*; (2), elongate rostral ramus of lacrimal that extends along the dorsal margin of the maxilla and terminates rostral to the apex of the ascending process of the maxilla*; (3), epipophyses present on third cervical vertebra; and (4), hyposphene present on at least dorsal vertebrae 6–8 and 11–15. Also distinguished by the following unique combination of characters: rostral ramus of lacrimal tapers to a point, ventrolateral process of premaxilla contacts prefrontal (also noted by Paul, 2008:201, as lack of contact between the lacrimal and nasal); quadrate gradually curves caudally along its entire length in lateral view (also noted by Paul, 2008:201, as “shaft nearly straight”); and convex dorsal margin of ilium (also noted by Carpenter and Ishida, 2010).