Squamata Oppel 1811 [Gauthier, Estes & de Queiroz 1988], nom. cl. inval. see Order Squamata Oppel, 1811
   Episquamata Vidal & Hedges, 2005
     Toxicofera Vidal & Hedges, 2005
       Anguimorpha Fürbringer, 1900 see Suborder Anguimorpha Fürbringer, 1900
         1.1 Family Xenosauridae Cope, 1866 [monotypic]
         1.2.1 Family Helodermatidae Gray, 1837 [monotypic] - Gila monsters
         1.2.2.1 Family Anniellidae Cope, 1864 [monotypic] - American legless lizards
         1.2.2.2 Family Anguidae Gray, 1825 - glass lizards and alligator lizards
         2.1 Family Shinisauridae Ahl, 1930 [monotypic]
         2.2.1 Family Lanthanotidae Steindachner, 1877 [monotypic] - earless monitors
         2.2.2 Family Varanidae Gray, 1827 [monotypic] - monitor lizards