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Re: pterosaur femora sprawl
Why should such a quadruped have an elongated pelvis and a fused sacrum
unless there were strong lever forces acting upon them?
For launch and landing. Compare frog ilia, and compare bird ilia & sacra
with the ilia & sacra of other theropods.
As additional evidence, as you know, the elongated pelvis was less
necessary in certain ornithocheirids, such as Arthurdactylus. Heck, even
the sacrum became unfused.
Unfused sacrum? In an adult? Are you sure it is adult...?