oxyphototroph prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
     Order Stigonematales Geitler (1925) see Order Nostocales Borzì (1914)
       Family Nostochopsaceae Geitler (1925) see Family Hapalosiphonaceae Elenkin (1917), nom. cons.
         1 Form genus Baradlaia P. Palik (1960) see Genus Baradlaia Palik 1960
         2 Form genus Mastigocladopsis M.O.P. Iyengar & Desikachary (1946) see Genus Mastigocladopsis Iyengar and Desikachary 1946
         3 Form genus Mastigocoleus G. Lagerheim ex Bornet & Flahault (1886) see Genus Mastigocoleus Lagerheim ex Bornet and Flahault 1886
         4 Form genus Nostochopsis Wood ex Bornet & Flahault (1886) see Genus Nostochopsis Wood ex Bornet and Flahault 1886