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 Viperidae Oppel, 1811 - vipers and pit vipers
           Subfamily Viperinae Oppel, 1811 - pitless vipers
             01 Genus Atheris Cope, 1862
             02 Genus Bitis Gray, 1842
             03 Genus Causus Wagler, 1830
             04 Genus Cerastes Laurenti, 1768
             05 Genus Daboia Gray, 1842
             06 Genus Echis Merrem, 1820
             07 Genus Eristicophis Alcock & Finn, 1897
             08 Genus Macrovipera Reuss, 1927
             09 Genus Montatheris Broadley, 1996
             10 Genus Montivipera Nilson, Tuniyev, Andren, Orlov, Joger & Herrmann, 1999
             11 Genus Proatheris Broadley, 1996
             12 Genus Pseudocerastes Boulenger, 1896
             13 Genus Vipera Laurenti, 1768