[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Algae L. (1753) see [unranked] Algae
     Phylum Rhodophycota
       Class Rhodophyceae Thuret (1855) - red algae see Phylum Rhodophyta Wettst. (1901)
         Order Gracilariales Fredericq & Hommers.
           Family Pterocladiophilaceae Fan & Papenfuss (1959)
             1 Genus Gelidiocolax N.L.Gardner (1927)
             2 Genus Holmsella Sturch (1926)