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Re: VALIDITY OF AVES



Please Stop sending me email

thank you
-----Original Message-----
From: Dinogeorge@aol.com <Dinogeorge@aol.com>
To: dannj@alphalink.com.au <dannj@alphalink.com.au>; dinosaur@usc.edu
<dinosaur@usc.edu>
Date: Thursday 13 August 1998 15:29
Subject: Re: VALIDITY OF AVES


>In a message dated 98-08-13 03:02:38 EDT, dannj@alphalink.com.au writes:
>
><< Surely you mean that the ancestor of modern birds was with all
> probability an archaeopterygian. The chances of any direct ancestor
> actually being fossilized (preserved, and found) is extremely slim.
> Archaeopteryx may be the "closest thing to an avian common ancestor"
> but it was not necessarily that exact species. >>
>
>If this were true, then Archaeopterygidae would be paraphyletic, since it
>certainly doesn't include its descendants, the modern birds. Cladists would
>say it is better to define Archaeopterygidae (or a higher taxon than
family)
>as "all birds closer to _Archaeopteryx_ than to modern birds." This at
least
>removes the common ancestor from Archaeopterygidae and keeps the group
>monophyletic.