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Re: Parts & Non-Recreation (was: Ceratonykus)

I would say that Iliofemoralis was at best a peripheral protractor in
most theropods (stance phase stabilisation [as in Hutchinson and
Gatesy 2000] seems more likely), and is probably pretty highly reduced
anyway in most Maniraptora, but I am not that familiar with
alvarezsaur pelves or femora. What's that idea based on? Everything
else you describe sound pretty much bird-like (save the supracetabular
crest, like you say). Expanded postacetabular ilium, lack of ventral
pelvic symphysis, etc. Does it have a unified trochanteric crest?

On 1 May 2011 11:19, Jaime Headden <qi_leong@hotmail.com> wrote:
 Hip musculature is unusual, but it seems to favor the caudofemoralis
brevis and iliofibularis muscles over the iliofemoralis. This implies
the leg extensors were dominant over the leg protractors, and more so
than in tyrannosaurs or ornithomimosaurs, so I hardly think this is
phylogenetic or just about speed. he same is true for all birds, of
course, but the developed supracetabular crest implies the femur was
probably not held subhorizontally, but rather vertically.