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Re: Removing segnosaurs from ...



In a message dated 95-08-30 19:03:32 EDT, Thomas_R_HOLTZ@umail.umd.edu (th81)
writes:

>So goes one phylogeny.  Another would have the tetradactyl pes of
>herrerasaurids, theropods, prosauropods, and ornithischians being primitive,
>with sauropod feet a "reversal" of sorts.  

I'm always suspicious of reversals that involve regaining a previously lost
feature, such as a digit: the Panda's thumb problem, if you know what I mean.

G.O.