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
           Subfamily Natricinae Bonaparte, 1838 - water snakes
             01 Genus Adelophis Dugès, 1879
             02 Genus Afronatrix Rossman & Eberle, 1977
             03 Genus Amphiesma Duméril & Bibron, 1854
             04 Genus Amphiesmoides Malnate, 1961
             05 Genus Anoplohydrus Werner, 1909
             06 Genus Aspidura Wagler, 1830
             07 Genus Atretium Cope, 1861
             08 Genus Balanophis Smith, l938
             09 Genus Clonophis Cope, 1889
             10 Genus Hologerrhum Günther, 1858
             11 Genus Hydrablabes Boulenger, 1891
             12 Genus Hydraethiops Günther, 1872
             13 Genus Iguanognathus Boulenger, 1898
             14 Genus Lycognathophis Boulenger, 1893
             15 Genus Macropisthodon Boulenger, 1893
             16 Genus Natriciteres Loveridge, 1953
             17 Genus Natrix Laurenti, 1768
             18 Genus Nerodia Baird & Girard, 1853
             19 Genus Opisthotropis Günther, 1872
             20 Genus Parahelicops Bourret, 1934
             21 Genus Pararhabdophis Bourret, 1934
             22 Genus Paratapinophis Angel, 1929
             23 Genus Regina Baird & Girard, 1853
             24 Genus Rhabdophis Fitzinger, 1843
             25 Genus Seminatrix Cope, 1895 see Genus Liodytes Cope, 1885
             26 Genus Sinonatrix Rossman & Eberle, 1977
             27 Genus Storeria Baird & Girard, 1853
             28 Genus Thamnophis Fitzinger, 1843
             29 Genus Trachischium Günther, 1858
             30 Genus Tropidoclonion Cope, 1860
             31 Genus Tropidonophis Jan, 1863
             32 Genus Virginia Baird & Girard, 1853
             33 Genus Xenochrophis Günther, 1864