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DINOSAURIA Owen, 1842

ORNITHISCHIA Seeley, 1887

ORNITHOPODA Marsh, 1881

IGUANODONTIA Dollo, 1888, sensu Sereno, 2005

ANKYLOPOLLEXIA Sereno, 1986,

sensu Sereno, 2005

STYRACOSTERNA Sereno, 1986,

sensu Sereno, 2005

HADROSAURIFORMES Sereno, 1997,

sensu Sereno, 1998

HADROSAUROIDEA Cope, 1870,

sensu Sereno, 2005

3.1. Fully assembled skull of IVPP V 12534, holotype of Equijubus normani, in (A) right lateral and (B) left lateral views. Scale bar equals 10 cm.

EQUIJUBUS NORMANI You, Luo, Shubin, Witmer, Tang, and Tang, 2003 (Figs. 3.1–3.20)

Holotype IVPP V 12534, complete skull and partial postcranium of a single individual.

Diagnosis For 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).

Horizon Middle Grey Unit, Xinminpu Group; Albian, Early Cretaceous (Tang et al., 2001).

Type Locality Gongpoquan Basin, Mazongshan area, Gansu Province, China.