 When originally named, Halszka Osmólska and Ewa Roniewicz, found that "Deinocheirus" was a carnosaurian, and because of its extremely unusual arms, named the monotypic family Deinocheiridae for it.Osmólska and Roniewicz found that Deinocheiridae could be placed within the superfamily Megalosauroidea, within the infraorder Carnosauria (Carnosauria at the time was a paraphyletic group of all large theropods).Previously, the only carnosaurian from that time and place in Asia was the tyrannosaurid "Tarbosaurus".