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Anatomy of dromaeosaurid Mahakala



From: Ben Creisler
bh480@scn.org


This new paper is not yet available on the AMNH site, where it would be
free.

Alan H. Turner, Diego Pol, and Mark A. Norell (2011)
Anatomy of Mahakala omnogovae (Theropoda: Dromaeosauridae), Tögrögiin
Shiree, Mongolia.
American Museum Novitates Number 3722:1-66. 2011 
doi: 10.1206/3722.2 
http://www.bioone.org/doi/abs/10.1206/3722.2


The dromaeosaurid Mahakala omnogovae is known from a unique specimen from
the Late Cretaceous deposits of the Djadokhta Formation at Tögrögiin
Shiree, Ömnögov Aimag, Mongolia. The holotype specimen is comprised of a
well-preserved but partial skull and a nearly complete postcranial
skeleton. Mahakala omnogovae is included in a comprehensive phylogenetic
analysis of Coelurosauria using a dataset, which reflects a greatly
expanded character set and taxon-sampling regime. Several interesting
features of Mahakala omnogovae have implications for deinonychosaurian and
avialan character evolution and for understanding patterns of size
variation and size change within paravian theropods. These morphologies
include the shape of the iliac blade, the triangular obturator process of
the ischium, and the evolution of the subarctometatarsalian condition. We
present an expanded diagnosis of Mahakala omnogovae, which included
following unique combination of characters (autapomorphies noted by *): a
ledgelike depression at the confluence of metotic strut and posterior
tympanic recess on the anterior face of the paroccipital process*, a
posteriorly tapering scapula; a shortened forelimb (humerus 50% femur
length); a strongly compressed and anteroposteriorly broad ulna tapering
posteriorly to a narrow edge*; elongate lateral crest on the posterodistal
femur*; anterior caudal vertebrae with subhorizontal, laterally directed
prezygapophyses*; a prominent supratrochanteric process; and the absence of
a cuppedicus fossa.

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