[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 Onkonema L. Geitler (1933) see Genus Onkonema Geitler 1933