Re: More phylogenetic taxonom (was Re: Def. of Ornithischia)

[Dinogeorge@aol.com]

In a message dated 97-06-13 03:26:09 EDT, th81@umail.umd.edu (Thomas R.
Holtz, Jr.) writes:

<< (Incidentally, the node joining Sauropsida and Synapsida is Amniota.  The
 (as yet unknown or unrecognized) most immediate common ancestor of reptiles
 and mammals was an amniote (by definition) but neither a sauropsid nor a
 synapsid (also by definition).) >>

This, by the way, makes the most immediate common ancestor of reptiles and
mammals a paraphyletic taxon, since it doesn't include >any< of its
decendants (let alone >all< of its descendants). You can't get away from
paraphyly...