Ophidia Brongniart, 1800
Count: [f†f] 39f; †9f [6 Oct 2016]
   Serpentes see Suborder Serpentes Linnaeus, 1758
  Count: [f†f] 39f; †6f [6 Oct 2016]
     Alethinophidia Nopcsa, 1923 see Infraorder Alethinophidia Nopcsa, 1923
    Count: [f†f] 34f; †4f [6 Oct 2016]
       Caenophidia Hoffstetter, 1939
      Count: [f†f] 20f; †4f [6 Oct 2016]
         Viperoidea Oppel, 1811 see Superfamily Colubroidea Oppel, 1811
        Count: [f†f] 3f; †2f [6 Oct 2016]
           Family †Russellophiidae Rage, 1975
          Count: -