Snakes are quite different from these other species so they are grouped in the order squamata, which only includes their close relatives the lizards.

    PHYLUM AND SUBPHYLUM - CHORDATA

       CLASS AND SUBCLASS - REPTILIA

           Order Squamata

           Suborder Ophidia (Serpentes) - Snakes
              (Typhlopoidea (Scolecophidia), Henophidia (Boidea)
              Xenophidia (Colubroidea = Caenophidia))

           Infraorder Henophidia (Boidea)

           Family Boidae

                       Subfamily Boinae (Boas)

                       -  Acrantophis
                       -  Boa
                       -  Candoia
                       -  Corallus

                       Subfamily Erycinae (Sand Boas)

                       -  Calabaria
                       -  Charina
                       -  Eryx
                       -  Gongylophis

                       Subfamily Pythoninae (Pythons)

                       -  Aspidites
                       -  Antaresia
                       -  Apodora
                       -  Bothrochilus
                       -  Leiopython
                       -  Liasis
                       -  Morelia
                       -  Python

                             -  -  Python curtus brongersmai
                             -  -  Python breitensteini