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Re: labels are imaginary

In a message dated 96-02-06 17:35:25 EST, pharrinj@PLU.edu (Nicholas J.
Pharris) writes:

>Excuse me, but there is a middle position as well.  I include arctomets 
>in the Aves, which is the sister group to the Archaeopterygiformes, which 
>includes Archaeopterygidae and Dromaeosauridae.  All descendants of the last

>common ancestor of, say, _Gallus_ and _Archaeopteryx_ belong in the taxon 

Actually, there are about as many different middle positions as there are
speciation nodes in between the common ancestor of Dinosauria and the common
ancestor of all extant birds.