Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Chromista Caval.-Sm. (1981) - chromists
                           Subkingdom Harosa Cavalier-Smith, 2010
                             Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               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
                                         Subclass Peritrichia Stein, 1859
                                           Order Sessilida Kahl, 1933
                                             01 Family Termitophryidae Lom, in Corliss, 1979 [monotypic]
                                             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 [monotypic]
                                             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