Serpentes see Suborder Serpentes Linnaeus, 1758
   Alethinophidia Nopcsa, 1923 see Infraorder Alethinophidia Nopcsa, 1923
     Caenophidia Hoffstetter, 1939
       Colubroidea Oppel, 1811
         1 Family Xenodermatidae Gray, 1849 see Family Xenodermidae Gray, 1849
         2.1.1 Family Pareatidae Hoffmann, 1890
         2.1.2 Family Viperidae Oppel, 1811 - vipers and pit vipers
         2.2.1.1 Family Homalopsidae Jan, 1863
         2.2.1.2 Family Lamprophiidae Fitzinger, 1843 [paraphyletic]
         2.2.1.2.n Family Elapidae Boie, 1827
         2.2.2 Family Colubridae Oppel, 1811 - colubrids