Superclass Spirotricha Bütschli, 1889 see Class Spirotrichea Bütschli, 1889
   Class Oligotrichea Bütschli, 1889 see Subclass Oligotrichia Bütschli, 1889
     Subclass Oligotrichia Bütschli, 1889
       Order Oligotrichida Bütschli, 1889 see Subclass Oligotrichia Bütschli, 1889
         Family Pelagostrombidiidae Agatha, 2004
           1 Genus Pelagostrombidium Krainer, 1991
           2 Genus Limnostrombidium Krainer, 1995