A recent redescription of the skull of "Tarbosaurus bataar" has shown that it was much narrower than that of "Tyrannosaurus rex" and that during a bite, the distribution of stress in the skull would have been very different, closer to that of "Alioramus", another Asian tyrannosaur.
Altri tirannosauridi scoperti nelle stesse formazioni di "T. rex" furono prima classificati come taxa separate, inclusi "Aublysodon" e "Albertosaurus megagracilis", l'ultimo essendo stato rinnominato "Dinotyrannus megagracilis" nel 1995.