living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Thallobionta
         Division Chromophycota see Phylum Chromophyta T.A.Chr. (1962), nom. nud.
           Class Phaeophyceae Hansgirg (1886) - brown algae
             Order Ectocarpales Bessey (1907)
               Family Ralfsiaceae Farlow (1881)
                 Genus Acrospongium Schiffner (1916)
                 Genus Analipus F.R. Kjellman (1889)
                 Genus Basispora D.M. John & G.W. Lawson (1974)
                 Genus Dipleura Green (1832)
                 Genus Endopleura Wynne (1982), orth. inval. see Genus Endoplura G.J. Hollenberg (1969)
                 Genus Hapalospongidion Saunders (1899)
                 Genus Hapterophycus W.A. Setchell & N.L.Gardner, in W.A. Setchell (1912)
                 Genus Jonssonia S. Lund (1959)
                 Genus Lithoderma J.E. Areschoug (1875)
                 Genus Mesospora Weber-van Bosse (1911)
                 Genus Nemoderma Schousboe ex Bornet (1892)
                 Genus Petroderma Kuckuck (1897)
                 Genus Porterinema Waern (1952)
                 Genus Pseudolithoderma Svedelius, in Engl. & Prantl (1911)
                 Genus Ralfsia Berk. (1843)
                 Genus Sorapion Kuckuck (1894)
                 Genus Symphyocarpus Rosenvinge (1893)