 Barnum Brown went on to collect several more tyrannosaurid specimens from Alberta , including the first to preserve the shortened , two @-@ fingered forelimbs characteristic of the group ( which Lawrence Lambe named Gorgosaurus libratus , " balanced fierce lizard " , in 1914 ) . A second significant find attributed to Gorgosaurus was made in 1942 , in the form of a well @-@ preserved , though unusually small , complete skull . The specimen waited until after the end of World War II to be studied by Charles W. Gilmore , who named it Gorgosaurus lancesnis . This skull was re @-@ studied by Robert T. Bakker , Phil Currie , and Michael Williams in 1988 , and assigned to the new genus Nanotyrannus . It was also in 1946 that paleontologists from the Soviet Union began expeditions into Mongolia , and uncovered the first tyrannosaur remains from Asia . Evgeny Maleev described new Mongolian species of Tyrannosaurus and Gorgosaurus in 1955 , and one new genus : Tarbosaurus ( " terrifying lizard " ) . Subsequent studies , however , showed that all of Maleev 's tyrannosaur species were actually one species of Tarbosaurus at different stages of growth . A second species of Mongolian tyrannosaurid was found later , described by Sergei Kurzanov in 1976 , and given the name Alioramus remotus ( " remote different branch " ) , though its status as a true tyrannosaurid and not a more primitive tyrannosaur is still controversial . 
