Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
               Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
                 Order †Trilophosauria Romer, 1956 [monotypic]
                   Family †Trilophosauridae Gregory, 1945
                     1 ?Genus †Anisodontosaurus Welles, 1947
                     2 Genus †Tricuspisaurus Robinson, 1957
                     3 Genus †Variodens Robinson, 1957
                     4 Genus †Trilophosaurus Case, 1928