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. Subfamily Mastigocladoideae see Family Hapalosiphonaceae Elenkin (1917), nom. cons. Genus Hapalosiphon C. Nägeli ex Bornet & Flahault (1886) see Genus Hapalosiphon Nägeli ex Bornet and Flahault 1886