[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
       Genus Hydrococcus Kütz. (1833), nom. cons. prop. see Genus Hydrococcus Kützing 1833 nom. cons.