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
       1 Class Karyorelictea Corliss, 1974
       2 Class Spirotrichea Bütschli, 1889
       3 Class Litostomatea Small & Lynn, 1981
       4 Class Prostomatea Schewiakoff, 1896
       5 Class Phyllopharyngea de Puytorac et al., 1974
       6 Class Nassophorea Small & Lynn, 1981
       7 Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
       8 Class Colpodea Small & Lynn, 1981