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 Cryptomonada Cavalier-Smith, 2004
                                   Class Cryptophyceaeᵀ F.E. Fritsch (1927)
                                     Order Cryptomonadales Pascher (1913)
                                       Family Hemiselmidaceae Butcher (1967)
                                         1.1 Genus Hemiselmisᵀ M. Parke (1949)
                                         1.2 Genus Planonephros T. Christensen (1978) [monotypic]
                                         2 Genus Protochrysis A.A. Pascher (1911)