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The skull and appendicular skeleton of Gryposaurus latidens, a saurolophine hadrosaurid (Dinosauria, Ornithopoda) from the early Campanian (Cretaceous) of Montana, USA

Albert Prieto-Marquez
The skull and appendicular skeleton of Gryposaurus latidens, a saurolophine hadrosaurid (Dinosauria, Ornithopoda) from the early Campanian (Cretaceous) of Montana, USA
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (March 2012) 49 (3): 510-532

Abstract

The osteology of the holotype and referred specimens of the saurolophine hadrosaurid, Gryposaurus latidens, from the lower Two Medicine Formation of Montana (USA), is described in detail. With an estimated early Campanian (Late Cretaceous) age, this dinosaur is one of the oldest known hadrosaurids. Gryposaurus latidens shows several autapomorphies, including dentary tooth crowns, with an apicobasal length/mesiodistal width ratio of 1.7-2.2, a single median carina, and large marginal denticles in sections of the dental battery; deep and oval depression on the posteroventral premaxillary surface; and, in the context of Hadrosauridae, a shallow lacrimal process of the rostral process of the jugal. Furthermore, G. latidens differs from G. notabilis and G. monumentensis in having a broadly arcuate anterolateral oral margin of the premaxilla, a posterior margin of the narial fenestra that is 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, and wide and shallow posteroventral margin of the rostral process of the jugal, among other characters. This study confirmed a previous hypothesis supporting G. latidens as the sister taxon to a clade composed of the other species of Gryposaurus.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 49
Serial Issue: 3
Title: The skull and appendicular skeleton of Gryposaurus latidens, a saurolophine hadrosaurid (Dinosauria, Ornithopoda) from the early Campanian (Cretaceous) of Montana, USA
Affiliation: Bayerische Staatssammlung fuer Palaeontologie und Geologie, Munich, Germany
Pages: 510-532
Published: 201203
Text Language: English
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 46
Accession Number: 2012-050193
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF grants EAR-0207744, DBI-0446224, and EAR-0959029
Illustration Description: illus.
N48°00'00" - N49°00'00", W114°04'60" - W111°30'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201226
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