[Class] Cyanobacteria "Stanier (1974)", nom. inval. - cyanoprokaryotes see Class Cyanophyceae Hauck (1885) Order Chroococcales Ardissone (1887) [paraphyletic] see Order Chroococcales corrig. Ardissone 1887 Family Entophysalidaceae Geitler (1925) see Family Chroococcaceae Nägeli (1849) Genus Placoma P.K.A. Schousboe ex Bornet & G. Thuret (1876), nom. illeg. see Genus Cyanoplacoma E.A. Molinari-Novoa & M.D. Guiry (2021)