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Re: pterosaur femora sprawl [forelimb sprawl only]
[...] the fore limbs are portrayed as sprawling (very sprawling, often
with the elbow anterior to the glenoid--
This is not what the tracks of fast-walking pterosaurs show. Tracks of
pterosaurs trampling around in one spot do show some sprawling, though.
On the other hand, if continuously quadrupedal, then there had to have
been a series of taxa with an increasingly laterally-oriented manus (what
would have caused this??).
Flying being a stronger selection pressure than walking. Anyway, walking
still works, see tracks mentioned above.