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 Nostocophycideae
                     Order Nostocalesᵀ Borzì (1914)
                       Family Nostocaceaeᵀ Eichler (1886)
                         Subfamily Nostocoideaeᵀ
                           1 Genus Aulosira O. Kirchner 1878 ex É. Bornet & C. Flahault 1886-1888[1888]
                           2 Genus Isocystis Borzí ex Bornet & Flahault (1888)
                           3 Genus Nodularia Mertens ex Bornet & Flahault (1888), nom. cons.
                           4 Genus Nostocᵀ Vaucher ex Bornet & Flahault (1888)
                           5 Genus Trichormus (J. Ralfs ex E. Bornet & C. Flahault) J. Komárek & K. Anagnostidis (1989)