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
         Genus Rivularia C.Agardh ex Bornet & Flahault (1886), nom. cons. see Genus Rivularia Agardh ex Bornet and Flahault 1886 nom. cons.