Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002 - cyanobacteria
                 Class "Cyanobacteria" Cavalier-Smith, 2002
                   Subclass Oscillatoriophycideae
                     Order Oscillatorialesᵀ Elenkin (1934)
                       Family Phormidiaceae Anagnostidis & Komárek (1988)
                         1 Genus Proterendothrix W.West & G.S.West (1897)
                         2 Genus Katagnymene Lemmermann (1899)
                         3 Genus Planktothricoides Suda & M.M. Watan. (2002)
                         4 Genus Leibleinia (M. Gomont) L. Hoffmann (1985)
                         5 Subfamily Microcoleoideae Hansgirg (1892)
                         6 Subfamily Phormidioideaeᵀ