[Class] Cyanobacteria "Stanier (1974)", nom. inval. - cyanoprokaryotes see Class Cyanophyceae Hauck (1885)
   Order Pleurocapsales Geitler (1925) see Order Chroococcales Ardissone (1887)
     Family Xenococcaceae Ercegović (1932) see Family Hydrococcaceae Kützing 1843
       1 Genus Xenococcus G. Thuret (1880) [polyphyletic] see Genus Xenococcus Thuret 1880
       2 Genus Xenotholos Gold-Morgan, Montejano & Komárek (1994) see Genus Xenotholos Gold-Morgan et al. 1994