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New Elmisaurus (Theropoda) specimens from Mongolia



Ben Creisler
bcreisler@gmail.com


A new online paper:

Philip J. Currie, Gregory F. Funston, and Halszka Osmólska (2105)
New specimens of the crested theropod dinosaur Elmisaurus rarus from Mongolia.
Acta Palaeontologica Polonica (in press)
doi:http://dx.doi.org/10.4202/app.00130.2014
http://app.pan.pl/article/item/app001302014.html




New specimens of Elmisaurus rarus from the Upper Cretaceous of
Mongolia (Nemegt Formation) preserve bones not previously found in
“elmisaurids” that help elucidate their relationships to Leptorhynchos
elegans and other oviraptorosaurs. Elmisaurus rarus and the North
American Leptorhynchos elegans are known from numerous but incomplete
specimens that are closely related to, but nevertheless clearly
distinguished from, Chirostenotes pergracilis and Epichirostenotes
curriei. These specimens include the first known cranial bone
attributed to Elmisaurus, the frontal, which clearly shows this animal
had a cranial crest (most of which would have been formed by the nasal
bones). The first vertebrae, scapula, femora, and tibiae from
Elmisaurus are also described. The Elmisaurinae can be distinguished
from the Caenagnathinae by the coossification of the tarsometatarsus
and smaller size at maturity. Examination of oviraptorosaur hindlimbs
reveals four distinct morphotypes, possibly attributable to
paleoecological differences.