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Re: Albertosaurus

In a message dated 97-01-31 07:34:57 EST,
T.Williams@cclru.randwick.unsw.edu.au (Tim Williams) writes:

<< _Tarbosaurus bataar_ - Ken Carpenter regards this as a species of 
 _Tyrannosaurus_.  George Olshevsky, however, discerns two separate 
 genera and species - _Tarbosaurus efremovi_ for a smaller version, 
 and _Jenghizkhan bataar_ for the larger one. >>

Figuring out whether _Tarbosaurus_ is distinct from _Tyrannosaurus_ using
morphology is very difficult because of the restoration work done on the
_Tarbosaurus_ specimens before they were mounted for display. The Russians
restored missing parts on their specimens by modeling them after American
tyrannosaurids, which may account for some of their apparent phyletic