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Re: Ave Maria



On Monday, September 8, 2003, at 12:29  PM, T. Michael Keesey wrote:

From: "T. Michael Keesey" <mightyodinn@yahoo.com>
Date: Mon Sep 8, 2003  12:29:15  PM Australia/Canberra
To: zone65@bigpond.com
Subject: Re: Ave Maria

--- zone65@bigpond.com wrote:
Hasn't the class Aves been subsumed into Reptilia, thereby rendering
all birds as dinosauria? Or is this still just hypothesis?

Under phylogenetic taxonomy and the most widely accepted phylogenetic
hypotheses, _Aves_ (the last common ancestor of _Archaeopteryx_ and modern
birds, plus all descendants) is part of _Dinosauria_ (the last common ancestor
of _Iguanodon_ and _Megalosaurus_, plus all descendants), which is part of
_Reptilia_ (the last common ancestor of _Testudines_, _Sphenodon_, _Squamata_,
and _Crocodylia_, plus all descendants).


This does not have any direct bearing on the question of whether, e.g.,
_Deinonychus_ is avian or not.


It doesn't, but what is Aves now if it isn't a class?

Peter Markmann