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 Scytonemataceae F.T. Kützing ex O. Kirchner in A. Engl. & H. Prantl (1898)
                         1 Genus Brasilonema Fiore et al. (2007)
                         2 Genus Kyrtuthrix Ercegovic (1929)
                         3 Genus Scytonemaᵀ C.Agardh ex Bornet & Flahault (1887)
                         4 Genus Scytonematopsis E.I. Kiseleva (1930)