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Re: Removing segnosaurs from ...



In a message dated 95-08-29 11:01:41 EDT, Thomas_R_HOLTZ@umail.umd.edu (th81)
writes:

>>8) Broad tetradactyl pes (which George Olshevsky quite convincingly 
>>    shows is not a "reversion").
>
>If you wish to be a strict Dollist (Dolloist?  sp.), sure.  If not, you can
>recognize that homeobox genes show that there really aren't any significant
>morphological characters that can't be reversed.

It would probably be a lot easier for the pinched metatarsal III of the
arctometatarsalian pes to evolve a second or third time than for the
tetradactyl prosauropod-like pes to re-evolve from the functionally tridactyl
theropod pes.  ;-)

G.O.