Antrodemus valens is a scientific name assigned by American paleontologist Joseph Leidy in 1870 to a very fragmentary allosaurid fossil from the Morrison Formation. Although the specimen quite possibly belonged to Allosaurus (and, indeed, some older dinosaur books listed Allosaurus as Antrodemus, because the latter name was specified first), it is impossible to determine this with any degree of accuracy due to the scanty remains of the holotype. Today, Antrodemus is considered a dubious name of little scientific value.