Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Reptilia Linnaeus, 1758 - reptiles
       Subclass Lepidosauria Duméril & Bibron, 1839
         Order Squamata Oppel, 1811
           Suborder Serpentes Linnaeus, 1758 - snakes
             Family Aniliidae Stejneger, 1907 - cylinder snakes
             Family Anomalepididae Taylor, 1939
             Family †Anomalophiidae Auffenberg, 1959
             Family †Archaeophiidae Janesch, 1906
             Family Boidae Gray, 1825 - pythons and boas
             Family Bolyeriidae Hoffstetter, 1946
             Family Colubridae Oppel, 1811 - colubrids
             Family †Dinilysiidae Romer, 1956
             Family Elapidae Boie, 1827
             Family Leptotyphlopidae Stejneger, 1891 - slender blind snakes
             Family †Nigeropheidae Rage, 1975 see Family Nigerophiidae Rage, 1975
             Family †Pachyophiidae Nopcsa, 1923
             Family †Palaeophiidae Lydekker, 1888
             Family †Simoliophiidae Nopcsa, 1925 see Family Pachyophiidae Nopcsa, 1923
             Family Tropidophiidae Brongersma, 1951
             Family Typhlopidae Merrem, 1820 - blind snakes
             Family Uropeltidae Müller, 1831 - shield-tail snakes
             Family Viperidae Oppel, 1811 - vipers and pit vipers