Suborder Ophidia - Snakes

    Superfamily Acrochordoidea

        * Family Acrochordidae (File Snakes)

    Superfamily Uropeltidae  (Pipe snakes and Sunbeam snakes)

        * Family Anomochilidae(Dwarf Pipe Snakes)
        * Family Cylindrophiidae (Asian Pipe Snakes)
        * Family Uropeltidae (Shield-tail Snakes)

    Superfamily Pythonidae (Pythons and relatives)

        * Family Loxocemidae (Mexican Burrowing Pythons)
        * Family Pythonidae (Pythons)
        * Family Xenopeltidae (Sunbeam Snakes)

    Superfamily Boidae (Booidea)

        * Family Boidae (Boas)
              o Subfamily Boinae (Boas and Anacondas)
              o Subfamily Ungaliophiinae (Dwarf Boas)
              o Subfamily Erycinae (Sand, Rubber, Rosy Boas)

    Superfamily Colubroidea

        * Family Colubridae (Colubrids)
              o Subfamily Colubrinae ( King, Milk, Gopher, Corn and others)
              o Subfamily Grayiinae
              o Subfamily Calamarinae
        * Family Dipsadidae 
              o Subfamily Dipsadinae 
              o Subfamily Heterodontinae 
              o Subfamily Xenodontinae 
        * Family Natricidae 
        * Family Pseudoxenodontidae

    Superfamily Elapoidea

        * Family Elapidae 
              o Subfamily Elapinae (Cobras, Coral Snakes, etc.)
              o Subfamily Hydrophiinae  (Sea Snakes)

        * Family Lamprophiidae 
              o Subfamily Atractaspidinae (Mole Vipers)
              o Subfamily Lamprophiinae 
              o Subfamily Psammophiinae 
              o Subfamily Pseudoxyrhophiinae

    Superfamily Homalopsoidea

        * Family Homalopsidae

    Superfamily Pareatoidea

        * Family Pareatidae

    Superfamily Typhlopoidea (Scolecophidia)

        * Family Anomalepididae (Dawn Blind Snakes)
        * Family Typhlopidae (Blind Snakes)
        * Family Leptotyphlopidae/Glauconiidae (Slender Blind Snakes)

    Superfamily Viperoidea

        * Family Viperidae (Vipers and Pit Vipers)
              o Subfamily Azemiopinae (Fea's Vipers
              o Subfamily Causinae (Causus Vipers)
              o Subfamily Crotalinae (Pit Vipers
              o Subfamily Viperinae (Vipers)

    Superfamily Xenodermatoidea

        * Family Xenodermatidae

    Currently not assigned to any Superfamily:

        * Family Aniliidae/Ilysiidae (Pipe Snakes)
        * Family Bolyeriidae (Round Island Boas)
        * Family Tropidophiidae (Dwarf Boas)