pteroid on prolacerts

[David Peters <davidrpeters@earthlink.net>]

> Sticking points have been 1) the greatly elongated, not reduced finger

four, 2) the extended, not reduced, toe five, 3) the pteroid, and 4) the

prepubis, 5) multi-cusped teeth, none of which are shared by archosaurs.

Luckily, one or more prolacertiforms share these.



David Marjanovic wrote:

What, the pteroid, too? Which ones?


In Cosesaurus Ellenberger found two unidentified carpals in the place
occupied by the preaxial carpal  and pteroid on pterosaurs. I also saw
them but just this year realized what they were.

I've also identified the pteroid (and all the fingers on both hands) in
Sharovipteryx and Longisquama, both reconstructed in this month's
Prehistoric Times.

The pteroid and preaxial carpal are centrale carpals that began their
migration in Macrocnemus.


Ref:

Peters, D. (2002) A New Model for the Evolution of the Pterosaur
Wing?with a twist. Historical Biology, Vol. 15, pp. 277?301.

David Peters