2 fragmentary skulls with associated postcranial skeletons. Valid species of the genus Albertosaurus (by monotype); senior subjective synonym of A. arctunguis, as established by Dale Alan Russell in 1970; renamed Deinodon sarcophagus by William Diller Matthew and Barnum brown in 1922 and Dryptosaurus sacrophagus (in error) by Oskar Kuhn in 1939; renamed Albertosaurus incrassatus by Friedrich von Huene in 1932, who considered it the same species as Laelaps incrassatus , described by Edward Drinker Cope in 1876. General discription: Albertosaurus sacrophagus was a large carnivorous dinosaur that stalked across western Canada some 5 to 8 million years before the end of the Mesozoic Era. Like other tyrannosaurids, it had very small, didactyl forelimbs; a large skull on a thick, muscular neck; and powerful jaws armed with large, serrated teeth.