[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 Gigartinales F.Schmitz
           Family Caulacanthaceae Kützing (1843)
             1 Genus Catenella Grev. (1830), nom. cons.
             2 Genus Caulacanthus Kuetzing (1843)
             3 Genus Feldmannophycus H. Augier & C. Boudouresque (1971)