oxyphototroph prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
     Order Chroococcales Ardissone (1887) see Order Chroococcales corrig. Ardissone 1887
       Family Hydrococcaceae Kützing (1843) see Family Hydrococcaceae Kützing 1843
         1 Form genus Cyanodermatium L. Geitler (1933) see Genus Cyanodermatium Geitler 1933
         2 Form genus Epilithia A. Ercegović (1932), nom. illeg. see Genus Epilithia Ercegović 1932 nom. illeg.
         3 Form genus Hormathonema A. Ercegović (1930), nom. illeg.
         4 Form genus Hydrococcus Kütz. (1833), nom. cons. prop. see Genus Hydrococcus Kützing 1833 nom. cons.
         5 Form genus Myxohyella L. Geitler (1925) see Genus Myxohyella Geitler 1925
         6 Form genus Onkonema L. Geitler (1933) see Genus Onkonema Geitler 1933
         7 Form genus Placoma P.K.A. Schousboe ex Bornet & G. Thuret (1876), nom. illeg. see Genus Cyanoplacoma E.A. Molinari-Novoa & M.D. Guiry (2021)
         8 Form genus Tryponema A. Ercegović (1929) see Genus Tryponema Ercegović 1929