Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] 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
                             [crown] 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 Spirotrichea Bütschli, 1889
                                         Subclass Stichotrichia Small & Lynn, 1985
                                           Order Stichotrichidaᵀ Fauré-Fremiet, 1961
                                             Family Spirofilidae von Gelei, 1929
                                               01 ?Genus Kahliela Tucolesco, 1962
                                               02 Genus Atractos Vörösváry, 1950
                                               03 Genus Chaetospira Lachmann, 1856
                                               04 Genus Hypotrichidium Ilowaisky, 1921
                                               05.1 Genus Microspiretta Jankowski, 1975
                                               05.2 Genus Spiretella Borror, 1972
                                               06 Genus Mucotrichidium Foissner et al., 1990
                                               07 Genus Plesiotricha Dragesco, 1970
                                               08 Genus Spirofilopsis Corliss, 1960
                                               09 Genus Stichotricha Perty, 1849
                                               10 Genus Strongylidium Sterki, 1878
                                               11 Genus Urospinula Corliss, 1960
                                               12 Genus Urostrongylum Kahl, 1932