Ophidia Brongniart, 1800
   Serpentes see Suborder Serpentes Linnaeus, 1758
     Alethinophidia Nopcsa, 1923 see Infraorder Alethinophidia Nopcsa, 1923
       Caenophidia Hoffstetter, 1939
         Colubroidea Oppel, 1811
           1 Family Pseudoxenodontidae McDowell, 1987 see Subfamily Pseudoxenodontinae
           2 Family Carphophiidae Zaher et al., 2009 see Subfamily Dipsadinae Guenther, 1858
           3 Family Dipsadidae Bonaparte, 1838 see Subfamily Dipsadinae Guenther, 1858
           4 Family Xenodontidae Bonaparte, 1845 see Subfamily Dipsadinae Guenther, 1858
           5 Family Natricidae Boettger, 1883 see Subfamily Natricinae Bonaparte, 1838
           6 Family Sibynophiidae Dunn, 1928 see Subfamily Sibynophiinae
           7 Family Calamariidae Bonaparte, 1838 see Subfamily Calamariinae
           8 Family Colubridae Oppel, 1811 - colubrids