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Re: Tarbosaurus?

In a message dated 7/21/00 10:46:03 PM EST, jeffmartz@earthlink.net writes:

<< The only real evidence we have whether or not the big and little 
Tarbosaurus specimens belong the same species or not is morphological, and 
morphological studies suggest there is a gradation in size and morphological 
change between the little and big tyrannosaur specimens consistant with 
ontogenetic change. >>

The original morphological studies of tarbosaurs found >four< different 
species in >three< different genera, which were later lumped into one species 
and still later unlumped into two species in two genera. I have yet to see 
any ontogenetic study of Asiatic tyrannosaurids, so I don't know where you 
got the idea that the smaller ones grade into the larger ones ontogenetically.