Order Squamata Oppel, 1811
   Suborder Serpentes Linnaeus, 1758 - snakes
     Infraorder Alethinophidia Nopcsa, 1923
       Parvorder Henophidia Hoffstetter, 1939
         Superfamily Booidea Gray, 1825 [monotypic]
           Family Boidae Gray, 1825 - pythons and boas
             1 Subfamily Boinae Gray, 1825 - boas see Family Boidae Gray, 1825
             2 Subfamily Erycinae Bonaparte, 1831 - sand boas see Family Erycidae Bonaparte, 1831
             3 Subfamily Calabariinae Underwood, 1976 see Family Calabariidae Gray, 1858
             4 Subfamily Pythoninae Fitzinger, 1826 - pythons see Family Pythonidae Fitzinger, 1826
             5 Subfamily Xenapeltinae Rieppel, 1979 see Family Xenopeltidae Bonaparte, 1845
             6 Subfamily Tropidophinae Brongersma, 1951 see Subfamily Tropidophiinae Brongersma, 1951
             7 Subfamily Bolyeriinae Hoffstetter, 1946 - Round Island boas see Family Bolyeriidae Hoffstetter, 1946