[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryota Whittaker & Margulis, 1978 see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Biliphyta Caval.-Sm. (1981) - red algae and glaucophytes see Kingdom Plantae Haeckel (1866)
         Phylum Rhodophyta Wettst. (1901) - red algae
           Subphylum Eurhodophytina G.W.Saunders & Hommers. (2004)
             Class Florideophyceae Cronquist (1960)
               Subclass Hildenbrandiophyceae M.A. Ruggiero, D.P. Gordon, Orrell, N. Bailly, Bourgoin, Brusca, Caval.-Sm., Guiry & P.M.Kirk (2015), orth. inval. [monotypic] see Subclass Hildenbrandiophycidae G.W.Saunders & Hommers. (2004)
                 1 Order Hildenbrandiales Pueschel & K.M.Cole (1982)