Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass Anapsida Osborn, 1903 - anapsids
                 Order †Cotylosauria Cope, 1880
                   1 Suborder †Captorhinomorpha Watson, 1917
                   2 Suborder †Procolophonomorpha Romer, 1964 see Order Procolophonomorpha Romer, 1964
                   3 Suborder †Promillerosauria
                   4 Suborder †Diadectosauria (Case, 1911)