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RE: Defending grades (Was: Re: Archaeopteryx (rant))



At 11:19 PM 19/06/03 -0500, grossber wrote:
While ancestral reptiles are also ancestral to aves, we should maintain this
distinction. Why? Because by placing them in the clade of reptiles, we would
have to do the same for mammals

Actually, not so according to modern cladistic views which place the synapsid-mammal line as a sister-group to the reptile-bird line. Thus mammals are synapsids, amniotes and tetrapods, but not reptiles (Neither are "mammal-like reptiles").



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