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 Placoma P.K.A. Schousboe ex Bornet & G. Thuret (1876), nom. illeg. see Genus Cyanoplacoma E.A. Molinari-Novoa & M.D. Guiry (2021)