organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     alveolates Cavalier-Smith see [unranked] Alveolata Cavalier-Smith, 1991
       Phylum Ciliophora Doflein, 1901 - ciliates
         Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
           Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
             1 Subclass Peniculia Fauré-Fremiet, 1956
             2 Subclass Scuticociliatia (E.B. Small, 1967)
             4 Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993 - hymenostome ciliates
             5 Subclass Apostomatia Chatton & Lwoff, 1928
             6 Subclass Peritrichia Stein, 1859
             7 Subclass Astomatia Schewiakoff, 1896