[Class] Cyanobacteria "Stanier (1974)", nom. inval. - cyanoprokaryotes see Class Cyanophyceae Hauck (1885)
   Order Pleurocapsales Geitler (1925) see Order Chroococcales Ardissone (1887)
     Family Hydrococcaceae Kützing (1843) see Family Hydrococcaceae Kützing 1843
       1 Genus Dalmatella A. Ercegović (1929) see Genus Dalmatella Ercegović 1929
       2 Genus Hormathonema A. Ercegović (1929) see Genus Hormathonema Ercegović 1929
       3 Genus Hydrococcus Kütz. (1833), nom. cons. prop. see Genus Hydrococcus Kützing 1833 nom. cons.
       4 Genus Myxohyella L. Geitler (1925) see Genus Myxohyella Geitler 1925
       5 Genus Onkonema L. Geitler (1933) see Genus Onkonema Geitler 1933
       6 Genus Tryponema A. Ercegović (1929) see Genus Tryponema Ercegović 1929