[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryota Whittaker & Margulis, 1978 see Domain Eukaryota Chatton, 1925
     Kingdom Chromista Caval.-Sm. (1981) - chromists
       Subkingdom Harosa Cavalier-Smith, 2010
         Infrakingdom Halvaria Cavalier-Smith, 2010
           Superphylum Alveolata Cavalier-Smith, 1991
             Phylum Ciliophora Doflein, 1901 - ciliates
               Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
                 Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
                   1 Subclass Apostomatia Chatton & Lwoff, 1928
                   2 Subclass Astomatia Schewiakoff, 1896 [monotypic]
                   3 Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993 - hymenostome ciliates
                   4 Subclass Peniculia Fauré-Fremiet, 1956
                   5 Subclass Peritrichia Stein, 1859
                   6 Subclass Scuticociliatia (E.B. Small, 1967)