Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Nostocophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval. [monotypic]
     Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
       Family Microchaetaceae Lemmermann (1907) see Family Rivulariaceae Frank (1886)
         Genus Microchaete G. Thuret ex Bornet & Flahault (1886), nom. cons. see Genus Microchaete Thuret ex Bornet and Flahault 1886 nom. cons.