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 Corbihelia Cavalier-Smith, 2015
             Superclass Corbistoma Cavalier-Smith, 2015
               Class Picomonadea Seenivasan, Sausen, Medlin & Melkonian, 2013 [monotypic]
                 Order Picomonadida Seenivasan, Sausen, Medlin & Melkonian, 2013 [monotypic]
                   Genus Picomonas Seenivasan, Sausen, Medlin & Melkonian, 2013