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Re: Quo vadis, T. rex? [long]

In a message dated 96-02-09 02:30:04 EST, pharrinj@PLU.edu (Nicholas J.
Pharris) writes:

>You know very well that the groups do not have to be extant.  Crocodiles 
>and birds are simply well-known and happen to be as far separated as any 
>two archosaurs can be.  One could just as well define Archosauria as "the 
>last common ancestor of _Anserimimus_ and _Desmatosuchus_ (just to be 
>obscure) + all its descendants", if one were so inclined.

Sure. Tell that to the crown-group cladists.