[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: The Return of More New Papers

Put another way, the inability to pronate does not define _Theropoda_

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.