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Re: pterosaur femora sprawl

----- Original Message ----- From: "David Peters" <davidpeters@att.net>
To: "John Conway" <john.a.conway@gmail.com>; "Dinosaur Mailing List" <dinosaur@usc.edu>
Sent: Thursday, June 05, 2008 7:59 AM
Subject: Re: pterosaur femora sprawl

True. But no pterosaurs walked, bipedally or quadrupedally, with a horizontal backbone.

Quetzalcoatlus can, due to the remarkable bony support shelves at the shoulder and elbow that carry the weight when the elbow is raised well above the shoulder.. However, that doesn't mean that they did -- walking in that configuration requires a reversal of the normal direction of the walking shoulder articulation.

All pterosaurs except "azhdarchids," ctenochasmatids, dorygnathids (that's one clade) and cycnorhamphids + ornithocheirids (a second clade).

Are you saying that azhdarchids were not soarers?