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Re: T-J Extinction event article (more media errors?)
On Sat, 12 May 2001 Dinogeorge@aol.com wrote:
> In a message dated 5/12/01 5:40:27 AM EST, email@example.com writes:
> << > But as far as cladistically restricting Mammalia to the crown group
> I don't advocate that, for the reasons you mention. >>
> It seems to me that the most reasonable clade that could be given the name
> Mammalia would be the clade of all amniotes more closely related to extant
> crown-group mammals than to the next closest (i.e., the other) amniote
> crown-group, which would be "reptilia+aves."
Don't hold your breath for people to call _Dimetrodon_ a mammal.
Why is this more reasonable than limiting it to the crown clade? I don't
understand that point.
T. MICHAEL KEESEY
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