Aublysodon
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The Aublysodon is a carnivorous dinosaur. Even before the badlands of North America started revealing the bones of Tyrannosaurus rex, many paleontologists from the late nineteenth century agreed that long, pointed teeth turning up in many localities in the Western United States belonged to the deadliest, most ferocious dinosaurs that ever lived. Problematically, at this time, many dinosaur taxons were named for isolated teeth; such genera include Trachodon, Paleoscincus, and Troodon. Scientists named is particular taxon Aublysodon. Since then, over a dozen species of this supposedly fearsome theropod have been described.
The first post-dentary remains of Aublysodon was a partial skull unearthed in Montana in the 1980s. The skull bore the same pointed teeth attached to a long narrow skull the length of an average human arm. This adaption resembles that of theropods designed for eating fish. Famous dinosaurologist and paleoartist Gregory S. Paul decided the skull should belong to a new species, Aublysodon molnari. Unfortunately, with only this partial skull and isolated teeth, very few other details can be given about this elusive animal. We do know that Aublysodon was widespread; its remains have been found in many locations.
As with some other theropods, many paleontologists no longer use Aublysodo as a valid genus. It is now widely considered to be just a juvenile Tyrannosaurus rex, due to longer teeth and larger eyes characteristic of younger specimens of that species.