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Re: DEFINE BIRD
On Mon, 20 Oct 1997, Jeffrey Martz wrote:
> Could someone post the precise definition of Aves? Variations not
> based on the assumptions that birds are descended from _Archaeopteryx_
> and/or theropods might be interesting.
Official cladistic definition: the most recent ancestor of _Archaeopteryx_
and modern birds and all of that ancestor's descendants.
There was another definition: the most exclusive clade containing all
modern-day birds. That one didn't catch on -- that clade is better termed
--T. Mike Keesey
http://umbc.edu/~tkeese1 -- Dinosaur Web Pages
- DEFINE BIRD
- From: Jeffrey Martz <martz@holly.ColoState.EDU>