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 Mastigocladaceae Geitler (1925) see Family Hapalosiphonaceae Elenkin (1917), nom. cons.
         1 Subfamily Brachytrichioideae (E. Bornet & C. Flahault) F.E. Fritsch (1945) see Family Symphyonemataceae Hoffmann, Komárek & Kaštovský (2005), nom. inval.
         2 Subfamily Mastigocladoideae see Family Hapalosiphonaceae Elenkin (1917), nom. cons.