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 Anapsida Osborn, 1903 - anapsids
               Order †Captorhinida
                 Suborder †Procolophonia Seeley, 1888 [monotypic] see Clade Procolophonia Seeley 1888 [Laurin & Reisz 1995]
                   Superfamily †Procolophonoidea Cope, 1889
                     1 Family †Nyctiphruretidae Efremov, 1938
                     2 Family †Procolophonidae Lydekker, 1889
                     3 Family †Sclerosauridae Nopsca, 1923 see Family Procolophonidae Lydekker, 1889