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Deinonychosaur from Mongolia



From: Ben Creisler
bh480@scn.org


A new online paper. I don't have a copy but it appears that the theropod is
not assigned a generic or specific name.

Prieto-Márquez, A., Minjin B. & Horner, J.R. (2011)
A diminutive deinonychosaur (Dinosauria: Theropoda) from the Early
Cretaceous of Öösh (Övörkhangai, Mongolia). 
Alcheringa, 1?19. ISSN 0311-5518.
DOI: 10.1080/03115518.2011.590401
http://www.tandfonline.com/doi/abs/10.1080/03115518.2011.590401


We describe a new specimen of small maniraptoran theropod from the Early
Cretaceous Öösh locality, Övörkhangai province, central Mongolia. This
exemplar ISMD-VP09 preserves a maxillary fragment, two teeth and partial
appendicular elements. The strict consensus of a parsimony analysis of 68
coelurosaur taxa places this theropod within Deinonychosauria with an
unresolved relationship with the other members of the clade. Support for
this clade was based on two unambiguous synapomorphies: maxillary dentition
with at least some teeth lacking denticles anteriorly, and ungual and
penultimate pedal phalanx II highly modified for hyperextension, with
ungual II being more strongly curved and substantially larger than that of
digit III. The finding of a new small theropod specimen in the Öösh
Formation adds to the deinonychosaur fossil record from the same beds,
until now restricted to the dromaeosaurid Shanag ashile.



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