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
         Family Xenosauridae Cope, 1866 [monotypic]
           1 Genus Xenosaurus Peters, 1861