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Gryposaurus latidens

Reptilia - Hadrosauridae

Taxonomy
Gryposaurus latidens was named by Horner (1992). Its type specimen is AMNH 5465, a partial skeleton, and it is a 3D body fossil. Its type locality is Hillside Quarry, MOR TM-055, which is in a Santonian/Campanian terrestrial horizon in the Two Medicine Formation of Montana.

Synonymy list
YearName and author
1992Gryposaurus latidens Horner p. 13
2001Gryposaurus latidens Horner et al. p. 7
2001Gryposaurus latidens Trexler p. 303
2004Gryposaurus latidens Horner et al. p. 440
2006Gryposaurus latidens Lund and Gates p. 272
2006Gryposaurus latidens Prieto-Márquez et al. p. 88
2007Gryposaurus latidens Gates and Sampson p. 353
2008Gryposaurus latidens Godefroit et al. p. 68
2010Gryposaurus latidens Prieto-Marquez p. 853
2010Gryposaurus latidens Prieto-Marquez and Salinas p. 828
2010Gryposaurus latidens Prieto-Márquez and Wagner p. 1243 fig. 3
2011Gryposaurus latidens Prieto-Márquez p. 63
2012Gryposaurus latidens Godefroit et al. p. 18 fig. 19
2012Gryposaurus latidens Prieto-Márquez p. 511
2012Gryposaurus latidens Ramírez-Velasco et al. p. 392
2013Gryposaurus latidens Prieto-Marquez
2014Gryposaurus latidens Farke and Herrero p. 191
2014Gryposaurus latidens Gates et al. p. 163
2014Gryposaurus latidens Prieto-Márquez and Wagner p. 595
2016Gryposaurus latidens Lehman et al. p. 345
2016Gryposaurus latidens Prieto-Márquez et al. p. 6
2016Gryposaurus latidens Prieto-Márquez and Gutarra p. 141
2017Gryposaurus latidens Cruzado-Caballero and Powell p. 7

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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()
Neodiapsida
SauriaGauthier 1984
RankNameAuthor
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
Ornithopoda()
Iguanodontia()
Dryomorpha
Ankylopollexia
Styracosterna
Hadrosauriformes
Hadrosauroidea()
familyHadrosauridae
subfamilyHadrosaurinaeLambe 1918
tribeKritosauriniLapparent and Lavocat 1955
genusGryposaurus
specieslatidens

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
T. A. Gates and S. D. Sampson 2007Dentary teeth shorter and wider than in other species of the genus. In addition, G. latidens possesses the following unique combination of characters: arched lateroventral margin on the maxilla; nasal arch positioned near the orbits and rising above the level of the frontals; and broad ‘U’-shaped posterior margin of the external naris. The humerus of G. latidens is larger and more robust than that of G. incurvimanus.
A. Prieto-Marquez 2010Hadrosaurid dinosaur of the genus Gryposaurus characterized by the following autapomorphies: wide and short dentary teeth (ratio of dorsoventral length to anteroposterior width of 1.7; Prieto-Marquez, 2008); coarse denticulation in dentary teeth composed of large papillae; excavations on the ventral surface of the premaxilla for union of the anteroventral process of the maxilla; gentle nasal arch and dorsoventrally shallower narial bar at the posterodorsal margin of the narial fenestra; highest point of the nasal crest located directly above the posterior margin of the narial fenestra (the highest point is located posterior to the posterior margin of the narial fenestra in G. notabilis and G. monumentensis); and posterior margin of the narial fenestra broader than in G. notabilis and G. monumentensis (diagnosis modified from that in Horner, 1992, and Gates and Sampson, 2007).
A. Prieto-Márquez 2012Saurolophine hadrosaurid of the genus Gryposaurus, possessing the following autapomorphies: wide and short dentary tooth crowns (apicobasal length/mesiodistal width ratio of 1.7–2.2) having a single median carina in the vast majority of teeth and, in ventral and anterior regions of the dental battery, coarse marginal denticulation composed of large papillae; deep and oval depression on the posterior region of the ventral surface of the premaxilla; and, in the context of Hadrosauridae, shallow lacrimal process of the rostral process of the jugal. In addition, G. latidens differs from G. notabilis and G. monumentensis in possessing a wider and more smoothly arcuate anterolateral oral margin of the premaxilla; posterior margin of the narial fenestra being wider than the dorsoventral depth of the proximal region of the narial bar, with a nasal crest that rises above the level of the frontals (in adults) and is located above the posterior margin of the narial fenestra; wide and shallow posteroventral margin of the rostral process of the jugal; angle between the proximal margin of the dentary and the alveolar edge of the tooth row greater than 150°; and narrower proximal constriction of the scapula (i.e., minimum width of constriction/maximum width of proximal region less than 0.60).