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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 a Barremian/Aptian terrestrial horizon in the Digou Formation of China. It is the type species of Equijubus.

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 Lund and Gates p. 272
2008Equijubus normani Chen et al. p. 310
2008Equijubus normani Paul p. 201
2009Equijubus normani Barrett et al. p. 35
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 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 Ramírez-Velasco et al. p. 391
2013Equijubus normani Zheng et al.
2014Equijubus normani McDonald et al. p. 46
2014Equijubus normani Tsogtbaatar et al. p. 116
2014Equijubus normani You et al. p. 73
2015Equijubus normani Tan et al. p. 245
2015Equijubus normani Verdú et al. p. 254
2016Equijubus normani Mori et al. p. 25
2017Equijubus normani Cruzado-Caballero and Powell p. 12 fig. 13

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
Ornithopoda()
Iguanodontia()
Dryomorpha
Ankylopollexia
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.

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).