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Re: Sauropod ancestry?

On Tue, 18 Jul 2000 T. Michael Keesey wrote

<< 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
was lost. >>

There's not very much known about the digits of the very first prosauropods. 
If sauropods split from prosauropods at an early stage in history there may 
have been a redevelopment like in therizinosaurids.

BTW: What are today the oldest pro-/sauropods with known pedal digits? Thanks.


Heinz Peter