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Re: TETRAPODS, PHYLOGENETIC TAXONOMY, AND CLEAR DEFINITIONS



Last night I wrote:


> Hopson discusses two
> definitions of Mammalia: the "classic" definition where a mammal is defined as
> anyhing that has all the features considered to be diagnostic of Mammalia; and
> Rowe's phylogenetic definition of Mammalia as a stem-based taxon (thx for the
> correct term) composed of the LCA of Theria and Monotremata, and all 
> descendants of
> that ancestor.

Gotta stop writing messages so late at night . . . of course, Rowe was using a 
_crown_
based definition there.  My mistake.

-- Jon W.