Superclass Spirotricha Bütschli, 1889 see Class Spirotrichea Bütschli, 1889
   Class Oligotrichea Bütschli, 1889 see Subclass Oligotrichia Bütschli, 1889
     Subclass Oligotrichia Bütschli, 1889
       Order Choreotrichida Small & Lynn, 1985
         Suborder Strobilidiina Small & Lynn, 1985
           1 Family Strobilidiidae Kahl, 1929
           2 Family Strombidinopsidae Small & Lynn, 1985
           3 Family Leegaardiellidae Lynn & Montagnes, 1988
           4 Family Lohmanniellidae Montagnes & Lynn, 1991