Tyrannosaurus rex, Osborn, 1905

Rauhut, Oliver W. M., 2003, The interrelationships and evolution of basal theropod dinosaurs, Special papers in palaeontology 69, pp. 1-213 : 44

Gilmore (1946) described an almost complete skull of a small tyrannosaur as Albertosaurus lancensis . Bakker et al. (1988) recognized the differences of this skull to other material of Albertosaurus , and proposed the new generic name Nanotyrannus . However, Carr (1999) argued that the type of

Nanotyrannus

represents a juvenile individual of

Tyrannosaurus rex

. This view is followed here.