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Re: Caudipteryx not a bird and more from APP



Ronald:

It isn't proven birds are more closely related to each other than to other
dinosaurs until their DNA has been compared to that of other dinosaurs.

So far it's only been compared to crocodiles.   Now all dinosaurs are more
closely related to each otehr than to crocodiles.
Yours,
Dora Smith
Austin, Texas
villandra@austin.rr.com
----- Original Message -----
From: "Ronald Orenstein" <ron.orenstein@rogers.com>
To: "Dora Smith" <villandra@austin.rr.com>; <twilliams_alpha@hotmail.com>;
<dinosaur@usc.edu>
Sent: Thursday, February 03, 2005 11:23 PM
Subject: Re: Caudipteryx not a bird and more from APP


> At 07:58 PM 2/3/2005, Dora Smith wrote:
> >I can see how the skeletons of birds differ from thsoe of their cousins -
> >but multiple lines of therapods were evolving in similar ways because
those
> >ways constituted strong adaptive advantages.   I am not saying that birds
> >did NOT evolve from a single line, but I'm not convinced it's proven.
>
> But if birds are monophyletic (which you seem to accept) then they MUST
> have evolved from a single ancestral line - that's what monophyletic
> means.  if all birds are more closely related to each other than to
> anything else (and I think that the evidence for this among Neornithes at
> least is overwhelming) then they could only have evolved from a single
> ancestral lineage.
>
>
> Ronald Orenstein
> 1825 Shady Creek Court
> Mississauga, ON L5L 3W2
> Canada
> 905-820-7886
> 905-569-0116 fax
> ron.orenstein@rogers.com
>
>