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
             Subclass Peritrichia Stein, 1859
               Order Sessilida Kahl, 1933
                 01 Family Termitophryidae Lom, in Corliss, 1979
                 02 Family Astylozoidae Kahl, 1935
                 03 Family Opisthonectidae Foissner, 1976
                 04 Family Ophrydiidae Ehrenberg, 1838
                 05 Family Vaginicolidae de Fromentel, 1874
                 06 Family Ellobiophryidae Chatton & Lwoff, 1923
                 07 Family Lagenophryidae Bütschli, 1889
                 08 Family Usconophryidae Clamp, 1991
                 09 Family Rovinjellidae Matthes, 1972
                 10 Family Vorticellidae Ehrenberg, 1838
                 11 Family Zoothamniidae Sommer, 1951
                 12 Family Operculariidae Fauré-Fremiet, in Corliss, 1979
                 13 Family Scyphidiidae Kahl, 1933
                 14 Family Epistylididae Kahl, 1933