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Re: Gryposaurus latidens (Ornithopoda: Hadrosauridae) osteology

It appears I don't have access to the most recent year of CJES - if
anyone could pass this along I'd be most appreciative.


On Thu, Feb 9, 2012 at 6:37 PM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
> A new online paper:
> Albert Prieto-Márquez (2012)
> 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 (advance online publication)
> doi: 10.1139/e11-069
> http://www.nrcresearchpress.com/doi/abs/10.1139/e11-069
> 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.

Scott Hartman
Scientific Advisor/Technical Illustrator
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