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Re: Pterosaur wing membranes



If Darren is referring to the photos that I've seen, they were ambiguous at best about an ankle attachment....

One confounding issue that has occurred to myself (and others before me) is that there could be membrane attached to the lateral portion of the hindlimbs, without that section of patagium actually attaching to the forelimb as well. If the animal folds up enough before burial, the difference between the different sections of membrane would be difficult to make out in the resulting fossil.


But, they sure are counterproductive for animals that are making use of dynamic soaring rather than convective soaring.

There is also the possibility that some very early pterosaurs, or even immediate pterosaur ancestors, had a broad-wing type patagium that ran from forelimb to hindlimb. The attachment site might have been constrained after this, with phylogenetic inertia maintaining the hindlimb attachment. This would lead to the retention of a narrow 'fillet' (as has already been discussed as a model), when the wing chord reduced under selection for dynamic soaring ability. That is, in fact, probably the most likely explanation for a 'fillet' design, should it prove accurate.


Cheers,

--Mike Habib