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 Rivulariaceae Frank (1886) see Family Rivulariaceae Frank 1886
         Form genus Gardnerula G. De Toni (1936) see Genus Gardnerula De Toni 1936