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Re: Sauropod ancestry?
On Tue, 18 Jul 2000 HPB1956@aol.com wrote:
> In a message dated 07/16/2000 DinoGeorge writes:
> << Early sauropods retain all five functioning pedal digits, whereas in
> prosauropods the fifth digit is reduced, vestigial, or lost (only a splint
> metatarsal V remains). It is extremely unlikely that sauropods re-evolved a
> complete fifth pedal digit from the prosauropod or herrerasaur condition. >>
> Therizinosaurids seems to be generally accepted as theropods nowadays. If so,
> doesn't this mean that the reexpression of the fith pedal digit in sauropods
> isn't that unlikely?
Therizinosauroidea simply took an already-existing digit and put it
back in contact with the ground (so to speak). For Sauropoda to have
evolved from Prosauropoda, they would have had to redevelop a digit that
A better analogy might be the "re-evolved" limbs of _Pachyrhachis_, if it
is a derived ophidian (which, AFAIAA, is still debatable).
T. Michael Keesey <email@example.com> | AIM <Ric Blayze> | ICQ <77314901>
My Worlds <http://dinosauricon.com/keesey>
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