Re: Prosauropods

["Aspidel" <aspidel@wanadoo.be>]

From: "Brent Jones" <brentasaurus23@yahoo.com>
>
> Does that rule out the possibility that prosauropods
> could have been basal theropods? Looking at the new
> discoveries (_Eoraptor_ and _Herrerrasaurus_), it
> looks like the prosauropod line would have risen out
> of a meat-eating bipedal archosaur, but what if that
> isn't the whole story? Could dinosaurs have evolved
> from small, omnivorous archosaurs that eventually gave
> rise to the prosauropods, from shich the rest of the
> dinosaurs evolved? Could there be some fossil out
> there, undiscovered, that puts first dinosaur back a
> little bit further?

Something else I just think about: most prosauropods (with the possible
exception of _Thecodontosaurus_) are either obligatory quadrupedal or
facultative quadrupedal. Their hands can pronate. CMIIW, there're no basal
theropods with hands which can pronate.
Is it possible that prosauropods and sauropods evolved from a possible more
basal dinosaur (which is still to be found) than known theropods, maybe
omnivorous, with 5-digits hands which could pronate ? (in this case, hands
not able to pronate would be a derived feature)

Maybe a dumb idea, I'm just an amateur paleoartist.

Thanks in advance, friendly - Luc J. "Aspidel" BAILLY.