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 Cryptomonada Cavalier-Smith, 2004
               Class Cryptophyceae F.E. Fritsch (1927)
                 Genus Guillardia D.R.A. Hill & R. Wetherbee (1990)