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Re: The Return of More New Papers

On 4/16/07, David Marjanovic <david.marjanovic@gmx.at> wrote:

Very good point. It's a plesiomorphy. The extant crocodiles can't pronate either -- they just sprawl enough that walking quadrupedally works in spite of that. Sauropodomorphs other than sauropods at least as derived as *Antetonitrus* were incapable of forearm pronation, too, and accordingly must have been obligatorily bipedal, too, as was recently published. Forearm pronation is an autapomorphy of Ornithischia, and of the "silesaurids" (if they aren't ornithischians in the first place), and presumably of various non-sprawling crurotarsans as well.

Ah, okay--in that case, you're right. I somehow missed that silesaurids were special in that regard. -- Mike Keesey