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Equijubus normani
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
| Year | Name and author |
|---|---|
| 2003 | Equijubus normani You et al. p. 348 figs. 1-2 |
| 2004 | Equijubus normani Norman p. 415 |
| 2005 | Equijubus normani Buffetaut et al. p. 578 |
| 2006 | Equijubus normani Buffetaut et al. p. 30 |
| 2006 | Equijubus normani Lund and Gates p. 272 |
| 2008 | Equijubus normani Chen et al. p. 310 |
| 2008 | Equijubus normani Paul p. 201 |
| 2009 | Equijubus normani Barrett et al. p. 35 |
| 2009 | Equijubus normani Galton p. 215 |
| 2010 | Equijubus normani Amiot et al. p. 354 |
| 2010 | Equijubus normani Carpenter and Ishida p. 148 |
| 2010 | Equijubus normani McDonald et al. p. 33 fig. 39 |
| 2010 | Equijubus normani McDonald et al. p. 808 fig. 10 |
| 2010 | Equijubus normani Prieto-Marquez and Salinas p. 835 fig. 20 |
| 2010 | Equijubus normani Prieto-Márquez p. 5 fig. 2 |
| 2010 | Equijubus normani Prieto-Márquez and Norell p. 6 |
| 2010 | Equijubus normani Prieto-Márquez and Wagner p. 1243 fig. 3 |
| 2010 | Equijubus normani Wu et al. p. 127 |
| 2010 | Equijubus normani You et al. p. 59 |
| 2011 | Equijubus normani Prieto-Márquez p. 774 |
| 2011 | Equijubus normani Wang et al. p. 135 |
| 2012 | Equijubus normani Averianov and Alifanov p. 519 |
| 2012 | Equijubus normani Ramírez-Velasco et al. p. 391 |
| 2013 | Equijubus normani Yang et al. p. 275 |
| 2013 | Equijubus normani Zheng et al. |
| 2014 | Equijubus normani McDonald et al. p. 46 |
| 2014 | Equijubus normani Tsogtbaatar et al. p. 116 |
| 2014 | Equijubus normani Xing et al. p. 1820 |
| 2014 | Equijubus normani You et al. p. 73 |
| 2015 | Equijubus normani Tan et al. p. 245 |
| 2015 | Equijubus normani Verdú et al. p. 254 |
| 2016 | Equijubus normani Fuentes Vidarte et al. p. 435 |
| 2016 | Equijubus normani Kim et al. p. 13 |
| 2016 | Equijubus normani Mori et al. p. 25 |
| 2016 | Equijubus normani Prieto-Márquez et al. p. 14 |
| 2017 | Equijubus normani Cruzado-Caballero and Powell p. 12 fig. 13 |
| 2018 | Equijubus normani Gates et al. p. 5 |
| 2018 | Equijubus normani Wu et al. p. 722 |
| 2019 | Equijubus normani You et al. p. 3 |
| 2022 | Equijubus normani 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.
†Equijubus normani You et al. 2003
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H.-L. You et al. 2003 | Equijubus 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 2008 | Premaxillary 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. 2014 | 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). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983 | |||||
Age range: Early/Lower Albian or 112.03000 to 109.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Albian | China (Gansu) | Iguanodontidae indet. (type locality: 45413) |