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Herrerasaurid feet



> 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
tridactyl
> > 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
>here.

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.
Vertebrate Paleontologist
Dept. of Geology
University of Maryland
College Park, MD  20742
Email:Thomas_R_HOLTZ@umail.umd.edu (th81)
Fax: 301-314-9661
Phone:301-405-4084