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 Heterokonta Caval.-Sm. (1986)
                                   Phylum Bigyra Cavalier-Smith, 1998
                                     Subphylum Opalozoa Cavalier-Smith, 1992
                                       Infraphylum Bikosia Cavalier-Smith, 2013 [monotypic]
                                         Class Bikoseaᵀ Cavalier-Smith, 2013
                                           Subclass Bicosidiaᵀ Cavalier-Smith, 2006
                                             Superorder Cyathobodoniae Cavalier-Smith, 1993
                                               Order Bicoecida Grassé, 1926
                                                 Family Bicosoecidae Stein, 1878
                                                   Genus Bicosoecaᵀ James-Clark, 1866
                                                     Bicosoeca ainikkiae Järnfelt (1956)
                                                     Bicosoeca borealis Hilliard (1971)
                                                     Bicosoeca epiphytica Hilliard (1971)
                                                     Bicosoeca gracilipes H. James-Clark (1867)
                                                     Bicosoeca lacustris H. James-Clark (1867)
                                                     Bicosoeca maris Picken (1941)
                                                     Bicosoeca mediterranea Pavillard (1916)
                                                     Bicosoeca mignotii Moestrup, Thomsen & Hibberd, in Vørs (1992)
                                                     Bicosoeca petiolata
                                                     Bicosoeca planctonica Kisselew (1931)
                                                     Bicosoeca pontica Valkanov (1970)
                                                     Bicosoeca vacillans Štolc (1888)