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Re: DEFINE BIRD

To: Jeffrey Martz <martz@holly.ColoState.EDU>
Subject: Re: DEFINE BIRD
From: "T. Mike Keesey" <tkeese1@gl.umbc.edu>
Date: Mon, 20 Oct 1997 22:50:43 -0400 (EDT)
Cc: dinosaur@usc.edu
In-reply-to: <Pine.A41.3.95.971020092136.120746E-100000@holly.ColoState.EDU>
Reply-to: tkeese1@gl.umbc.edu
Sender: owner-dinosaur@usc.edu

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
Neornithes.

--T. Mike Keesey
tkeese1@gl.umbc.edu
http://umbc.edu/~tkeese1 -- Dinosaur Web Pages

References:
- DEFINE BIRD
  - From: Jeffrey Martz <martz@holly.ColoState.EDU>

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