The first post-dentary remains of Aublysodon were a partial skull unearthed in Montana in the 1980s. The skull bore the same pointed teeth attached to a long tapered 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 class, 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 Dinosaurs was extensive; 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 extensively considered to be just a juvenile Tyrannosaurus rex, due to longer teeth and larger eyes characteristic of younger specimens of that species.