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 Rhodophycota see Phylum Rhodophyta Wettst. (1901)
           Class Rhodophyceae Thuret (1855) - red algae see Phylum Rhodophyta Wettst. (1901)
             Subclass Florideophycideae see Class Florideophyceae Cronquist (1960)
               Order Gigartinales F.Schmitz
                 Family Gymnophlaeaceae
                   1 Genus Titanophora (J.Agardh) J. Feldmann (1942)
                   2 Genus Nemastoma J.Agardh (1842)
                   3 Genus Schizymenia J.Agardh (1851)
                   4 Genus Platoma Schousboe ex Schmitz (1894)