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Re: Rhinorex, new hadrosaurid from Upper Cretaceous of central Utah (free pdf)

Ben Creisler

A press release with artwork...



On Wed, Sep 17, 2014 at 9:27 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> A new online paper:
> Terry A. Gates & Rodney Scheetz (2014)
> A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the
> Campanian of Utah, North America.
> Journal of Systematic Palaeontology (advance online publication)
> DOI:10.1080/14772019.2014.950614
> http://www.tandfonline.com/doi/full/10.1080/14772019.2014.950614#.VBm1mfldXTo
> A new hadrosaurid is described from the Upper Cretaceous Neslen
> Formation of central Utah. Rhinorex condrupus gen. et sp. nov. is
> diagnosed on the basis of two unique traits, a hook-shaped projection
> of the nasal anteroventral process and dorsal projection of the
> posteroventral process of the premaxilla, and is further
> differentiated from other hadrosaurid species based on the morphology
> of the nasal (large nasal boss on the posterodorsal corner of the
> circumnarial fossa, small protuberences on the anterior process,
> absence of nasal arch), jugal (vertical postorbital process),
> postorbital (high degree of flexion present on posterior process), and
> squamosal (inclined anterolateral processes). This new taxon was
> discovered in estuarine sediments dated at approximately 75 Ma and
> just 250 km north of the prolific dinosaur-bearing strata of the
> Kaiparowits Formation, possibly overlapping in time with Gryposaurus
> monumentensis. Phylogenetic parsimony and Bayesian analyses associate
> this new taxon with the Gryposaurus clade, even though the type
> specimen does not possess the diagnostic nasal hump of the latter
> genus. Comparisons with phylogenetic analyses from other studies show
> that a current consensus exists between the general structure of the
> hadrosaurid evolutionary tree, but on closer examination there is
> little agreement among species relationships.