They may represent teeth from juvenile individuals of T. rex as they were found in the Maastrichtian Lance Formation. In 1903 John Bell Hatcher renamed Laelaps explanatus Cope 1876 into an Aublysodon explanatus. This probably represents a tooth of Saurornitholestes. In 1932 Friedrich von Huene classified a fragmentary skeleton named Ornithomimus grandis by Marsh in 1890 as Aublysodon grandis, but most later researchers have considered this a synonym of the Campanian tyrannosaur Deinodon horridus. In 1967 Alan Jack Charig named three species: Aublysodon lancinator, Aublysodon novojilovi and Aublysodon lancensis; these had originally been species of Gorgosaurus. The first two are today seen as juvenile specimens of Tarbosaurus; the last represents either a juvenile individual of Tyrannosaurus or a separate genus Nanotyrannus. The first skeletal material referred to an original Aublysodon species was a partial skull unearthed in Jordan, Montana in 1966 and described by Ralph Molnar in 1977/1978. The skull, specimen LACM 28741 at forty-five centimetres the length of an average human arm, bore pointed teeth attached to a long narrow snout. First thought to be a juvenile Tyrannosaurus, then interpreted as a large dromaeosaurid, this "Jordan theropod" was given the name Aublysodon molnaris by Gregory S. Paul in 1988; in 1990 the name was by Paul emended to Aublysodon molnari, applying the correct genitive. It was made a separate genus Stygivenator by George Olshevsky in 1995, but was later, in 2004, reinterpreted to be a juvenile Tyrannosaurus rex by Thomas Carr and Tom Williamson. Another partial skeleton from New Mexico, specimen OMNH 10131, was in 1990 considered to represent Aublysodon, but later research by Thomas Carr and Tom Williamson first referred it to Daspletosaurus and ultimately to Bistahieversor. In 1988 Paul also created another species when renaming Shanshanosaurus huoyanshanensis Dong 1977 into Aublysodon huoyanshanensis. It probably represents a Tarbosaurus specimen. Classification Cope assigned Aublysodon to the Goniopoda in 1870, a group roughly equivalent to the modern Theropoda. Marsh however, in 1892 was misled by the small size of the teeth, their D-shaped cross-section and their lack of serrations into considering Aublysodon a mammal exceptionally large for the Cretaceous. By the early twentieth century it was again generally understood that Aublysodon was a theropod reptile; later it would be typically assigned to the Deinodontidae, a group today called the Tyrannosauridae. Aublysodon was by Paul in 1988 thought to belong to a unique subfamily of tyrannosaurids called the Aublysodontinae, a name