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 Hacrobia Okamoto, Chantangsi, Horák, Leander & Keeling, 2009
                             Phylum Cryptista Cavalier-Smith, 1986
                               Subphylum Rollomonadia Cavalier-Smith, 2013
                                 Superclass Leucocrypta Cavalier-Smith, 2004 [monotypic]
                                   Class Leucocrypteaᵀ Caval.-Sm. (2004) [monotypic]
                                     Order Kathablepharida Cavalier-Smith, 1993 [monotypic]
                                       Family Kathablepharidaeᵀ Vørs, 1992, orth. zool.
                                         Genus Roombia Okamoto, Chantangsi, Horák, Leander & Keeling, 2009 [monotypic]
                                           Roombia truncataᵀ Okamoto, Chantangsi, Horák, Leander & Keeling, 2009