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 Lepidosauromorpha Benton, 1983 see Subclass Lepidosauromorpha Benton, 1983
                 Superorder Lepidosauria Haeckel, 1866 see Superorder Lepidosauriformes Gauthier, Estes & de Queiroz, 1988
                   Order Squamata Oppel, 1811
                     Suborder Lacertilia Owen, 1842
                       Infraorder Diploglossa Cope, 1864 see Suborder Anguimorpha Fürbringer, 1900
                         Superfamily Varanoidea Gray, 1827
                           1 Family †Necrosauridae Hoffstetter, 1943
                           2 Family Helodermatidae Gray, 1837 - Gila monsters
                           3 Family Varanidae Gray, 1827 - monitor lizards
                           4 Family Lanthanotidae Steindachner, 1877 - earless monitors
                           5 Family †Aigialosauridae Kramberger, 1892 - aigialosaurs
                           6 Family †Dolichosauridae Gervais, 1852 - dolichosaurs
                           7 Family †Mosasauridae Gervais, 1853 - mosasaurs