living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryotae see Superkingdom Prokarya
     Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990
       Division Cyanophycota see Phylum Cyanobacteria (ex Stanier 1974) Cavalier-Smith 2002
         Class Cyanophyceae Schaffner (1909) see Class Cyanobacteria Cavalier-Smith, 2002
           Order Nostocales Borzì (1914)
             1 Family Microchaetaceae Lemmermann (1907)
             2 Family Rivulariaceae Kützing (1843)
             3 Family Nostocaceae Eichler (1886)
             4 Family Oscillatoriaceae Engl. (1898), nom. cons.
             5 Family Gomontiellaceae Elenkin (1934)
             6 Family Scytonemataceae F.T. Kützing ex O. Kirchner in A. Engl. & H. Prantl (1898)