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Saurolophus morrisi, new hadrosaur species from California



From: Ben Creisler
bh480@scn.org

 A new dino species:

Albert Prieto-Márquez and Jonathan R. Wagner (2011)
Saurolophus morrisi, a new species of hadrosaurid dinosaur from the Late
Cretaceous of the Pacific coast of North America.
Acta Palaeontologica Polonica (in press)
doi:10.4202/app.2011.0049
http://app.pan.pl/article/item/app20110049.html


We describe and re-evaluate the systematics of specimens from the
Maastrichtian Moreno Formation of California (western USA) as a new species
of Saurolophus, the only known genus of hadrosaurid dinosaur widespread in
Asia and North America. Recognition of this new species adds substantially
to the record of the taxonomic diversity of these animals west of the Rocky
Mountains. The new species, S. morrisi, is diagnosed by the possession of a
postorbital having ornamentation in form of wide oblique groove on jugal
process. Placement of this new species in Saurolophus considerably expands
the distribution of this genus, although this referral is arbitrary since
phylogenetic analysis places the new species outside of the clade formed by
S. osborni and S. angustirostris. However, recognition of a new, endemic
Californian hadrosaurid, especially one so closely related to both Asian
and North American species, may have implications for future studies of
both the internal biogeography of Western North America, and the history of
exchange with Asia.



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