eukaryotes see Domain Eukaryota Chatton, 1925
   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 Leucocryptea Caval.-Sm. (2004) [monotypic]
                 Order Kathablepharida Cavalier-Smith, 1993
                   Genus Roombia Okamoto, Chantangsi, Horák, Leander & Keeling, 2009