 Allosaurus <unk> was described in 1870 by <unk> as a species of Megalosaurus , based on a tooth from the Late Jurassic of Switzerland . It has occasionally been referred to Allosaurus , but recent reviews have listed it as dubious theropod species Megalosaurus <unk> , or included it in Ceratosaurus sp . Allosaurus stechowi was described in 1920 by <unk> as Labrosaurus stechowi for isolated Ceratosaurus @-@ like teeth from the <unk> beds of Tanzania . With the <unk> of Labrosaurus and Allosaurus , Donald F. <unk> listed it as a species of Allosaurus , but it is now either assigned to Ceratosaurus sp. or considered a dubious <unk> . 
