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Re: FYI -- Microraptor gui, Burnham and Alexander, PNAS...
Excellent point regarding the myology - articulation fidelity is often
analyzed without incorporating constraints of muscular anatomy,
including moment arm changes that may preclude the proposed motion.
And, as I suggested in my earlier post, I see no reason at all to make
the poor thing sprawl to begin with.
Assistant Professor of Biology
Woodland Road, Pittsburgh PA 15232
Buhl Hall, Room 226A
On Jan 26, 2010, at 2:58 PM, David Marjanovic wrote:
Twelfth post and beyond, required reading for any one going to
comment on the "impossible" leg-sprawling flight posture of the
That's a case of "wait for the paper that won't even be begun
Importantly, however, those posts explicitly don't argue for the
180°-sprawled pose that Burnham et al. wanted to squeeze *M.* into.
I was there at their talk at the SVP meeting of 2008, and they had a
reconstruction where the femoral head pointed not into the
acetabulum but ventrally (vertically downwards), and the
trochanteric crest touched the ilium, leaving _no_ space for the
very muscles that would have pulled the legs up into this pose! That