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Re: Augustynolophus, new hadrosaur genus (for Saurolophus morrisi) from California



The paper is now officially published:

Albert Prieto-Márquez, Jonathan R. Wagner, Phil R. Bell and Luis M.
Chiappe (2015)
The late-surviving ‘duck-billed’ dinosaur Augustynolophus from the
upper Maastrichtian of western North America and crest evolution in
Saurolophini.
Geological Magazine 152: 225-241
DOI: http://dx.doi.org/10.1017/S0016756814000284
http://128.232.233.5/action/displayAbstract?fromPage=online&aid=9298467&fulltextType=RA&fileId=S0016756814000284


Available here in earlier form:
http://www.researchgate.net/publication/264826222_The_late-surviving_%27duck-billed%27_dinosaur_Augustynolophus_from_the_upper_Maastrichtian_of_western_North_America_and_crest_evolution_in_Saurolophini

On Thu, Jul 10, 2014 at 8:00 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> A new online paper:
>
> Albert Prieto-Márquez, Jonathan R. Wagner, Phil R. Bell and Luis M.
> Chiappe (2014)
> The late-surviving ‘duck-billed’ dinosaur Augustynolophus from the
> upper Maastrichtian of western North America and crest evolution in
> Saurolophini.
> Geological Magazine (advance online publication)
> DOI: http://dx.doi.org/10.1017/S0016756814000284
> http://128.232.233.5/action/displayAbstract?fromPage=online&aid=9298467&fulltextType=RA&fileId=S0016756814000284
>
>
>
>
> We amend the taxonomy and provide new anatomical information on the
> hadrosaurid dinosaur Saurolophus morrisi (upper Maastrichtian Moreno
> Formation, central California, USA) derived from full preparation of
> the referred skull roof. The cranial morphology of this species is
> distinct enough to justify the new combination Augustynolophus morrisi
> gen. nov. The morphology of the nasals and surrounding cranial bones
> indicates that A. morrisi sported a solid nasal crest ending in an
> elongate triangular plate that extended above the skull roof.
> Autapomorphies include a crescentic base of the frontal caudodorsal
> process and extension of the process caudal to the frontal ‘dome’;
> distal end of nasal crest with knob-like process inflected rostrally;
> circumnarial depression lightly incised and weakly emarginated,
> adjacent to caudolateral margin of nasal and occupying two-thirds the
> width of lateral surface of distal region of crest; and caudal surface
> of distal nasal crest subrectangular. We formally establish the new
> tribe Saurolophini consisting of Prosaurolophus, Augustynolophus and
> Saurolophus. Saurolophin synapomorphies include a premaxilla with
> broad arcuate contour of rostrolateral region of thin everted oral
> margin and flat and steeply inclined occlusal surface of dentary
> dental battery, among other characters. Saurolophin crests evolved
> towards increasing caudodorsal length, along with caudal extension of
> the circumnarial fossa and involvement into the crest of adjacent
> facial elements. Augustynolophus is the second described genus of
> North American late Maastrichtian hadrosaurids. Its recognition
> implies a greater diversity among late Maastrichtian dinosaur faunas
> than previously recognized and is congruent with hypotheses of
> endemism and/or provinciality during Late Cretaceous time.