Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
   Phylum Alveolata Cavalier-Smith, 1991 see Superphylum Alveolata Cavalier-Smith, 1991
     Subphylum Ciliophora Doflein, 1901 see Phylum Ciliophora Doflein, 1901
       Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
         1 Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993 - hymenostome ciliates
         2 Subclass Peritrichia Stein, 1859