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 Lepidosauria Duméril & Bibron, 1839
                 Order Rhynchocephalia Günther, 1867 - tuataras
                   Suborder Sphenodontida Carroll, 1985 see Order Sphenodontida Carroll, 1985
                     Family Sphenodontidae Cope, 1871 - tuataras
                       1 Genus †Homoeosaurus Meyer, 1845
                       2 Genus Sphenodon Gray, 1831