life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Empire Eukaryota (Chatton, 1925) see Domain Eukaryota Chatton, 1925
     Superkingdom Metakaryota see Domain Eukaryota Chatton, 1925
       Kingdom Protozoa Goldfuss, 1818 - protozoa
         Subkingdom Dictyozoa Cavalier-Smith, 1991
           Branch Bikonta Cavalier-Smith, 1993
             Infrakingdom Neozoa Cavalier-Smith, 1993
               Parvkingdom Alveolata Cavalier-Smith, 1991 see Superphylum Alveolata Cavalier-Smith, 1991
                 Superphylum Heterokaryota Hickson, 1903 [monotypic]
                   Phylum Ciliophora Doflein, 1901 - ciliates
                     1 Class Spirotrichea Bütschli, 1889
                     2 Class Prostomatea Schewiakoff, 1896
                     3 Class Litostomatea Small & Lynn, 1981
                     4 Class Phyllopharyngea de Puytorac et al., 1974
                     5 Class Nassophorea Small & Lynn, 1981
                     6 Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
                     7 Class Colpodea Small & Lynn, 1981
                     8 Class Karyorelictea Corliss, 1974