Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] 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 Harosa Cavalier-Smith, 2010
                             [crown] Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               Infrakingdom Halvaria Cavalier-Smith, 2010
                                 Superphylum Heterokonta Caval.-Sm. (1986)
                                   Phylum Ochrophyta Caval.-Sm. (1995)
                                     Subphylum Phaeista Caval.-Sm. (1995)
                                       Infraphylum Marista Caval.-Sm. (2006)
                                         Superclass Fucistia Caval.-Sm. (1995)
                                           Class Phaeophyceae Hansgirg (1886) - brown algae
                                             Order Chordariales
                                               Family Ralfsiaceae Farlow (1881)
                                                 Genus Analipus F.R. Kjellman (1889)
                                                 Genus Basispora D.M. John & G.W. Lawson (1974)
                                                 Genus Dipleura Green (1832)
                                                 Genus Hapalospongidion Saunders (1899)
                                                 Genus Hapterophycus W.A. Setchell & N.L.Gardner, in W.A. Setchell (1912)
                                                 Genus Lithoderma J.E. Areschoug (1875)
                                                 Genus Mesospora Weber-van Bosse (1911)
                                                 Genus Porterinema Waern (1952)
                                                 Genus Pseudolithoderma Svedelius, in Engl. & Prantl (1911)
                                                 Genus Ralfsiaᵀ Berk. (1843)
                                                 Genus Stragularia Stroemfelt (1886)