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
         Form genus Hormathonema A. Ercegović (1930), nom. illeg.