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> From: Dinogeorge@aol.com
> > 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
> > theropod pes. ;-)
>I seem to remember that the herrerasaurs had a tetradactyl foot.
>Is this correct? I suggest that a seperate descent from the
>herrerasaurs is another possiblity that needs to be considered
Yes, herrerasaurs have a tetradactyl foot. So do basal ornithischians,
prosauropods, most basal dinosauromorphs, and pterosaurs. The tetradactyl
pes is primitive for Ornithodira (at least).
Thomas R. Holtz, Jr.
Dept. of Geology
University of Maryland
College Park, MD 20742