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)
                         Subfamily Phormidioideaeᵀ
                           1 Genus Arthrospira E. Stizenberger ex Gomont 1892-1893[1893] [ICBN]
                           2 Genus Phormidiumᵀ F.T. Kützing ex Gomont 1892-1893[1893]
                           3 Genus Planktothrix K. Anagnostidis & J. Komárek 1988 [ICBN]
                           4 Genus Porphyrosiphon F.T. Kützing ex Gomont (1892)
                           5 Genus Pseudophormidium (A. Forti) K. Anagnostidis & J. Komárek (1988)
                           6 Genus Symploca F.T. Kützing ex Gomont 1892-1893[1893] [ICBN]
                           7 Genus Trichodesmium Ehrenb. ex Gomont (1893)
                           8 Genus Tychonema Anagnostidis & Komárek 1988 [ICBN]