Squamata Oppel 1811 [Gauthier, Estes & de Queiroz 1988], nom. cl. inval. see Order Squamata Oppel, 1811
   Episquamata Vidal & Hedges, 2005
     Toxicofera Vidal & Hedges, 2005
       Serpentes see Suborder Serpentes Linnaeus, 1758
         Family Colubridae Oppel, 1811 - colubrids
           01 Genus Blythia Theobald, 1868, incertae sedis
           02 Genus Cyclocorus Duméril, 1853, incertae sedis
           03 Genus Elapoidis Boie, 1827, incertae sedis
           04 Genus Gongylosoma Fitzinger, 1843, incertae sedis
           05 Genus Helophis Witte & Laurent, 1942, incertae sedis
           06 Genus Myersophis Taylor, 1963, incertae sedis
           07 Genus Oreocalamus Boulenger, 1899, incertae sedis
           08 Genus Poecilopholis Boulenger, 1903, incertae sedis
           09 Genus Rhabdops Boulenger, 1893, incertae sedis
           10 Genus Tetralepis Böttger, 1892, incertae sedis
           11.1 Subfamily Calamariinae
           11.2 Subfamily Pseudoxenodontinae
           12.1.1 Subfamily Sibynophiinae
           12.1.2.1 Subfamily Grayiinae [monotypic]
           12.1.2.2 Subfamily Colubrinae Oppel, 1811
           12.2.1 Subfamily Natricinae Bonaparte, 1838 - water snakes
           12.2.2 Subfamily Dipsadinae Guenther, 1858 - American snail-eating snakes