Kingdom Protoctista Hogg, 1860
   Phylum Chlorophyta Pascher (1914) - green algae
     Class Chlorophyceae Wille (1884) - chlorophytes
       Order Chlorococcales Pascher see Order Chlamydomonadales F.E. Fritsch
         Family Oocystaceae Bohlin
           1 Genus Oocystis A.Braun
           2 Genus Chlorella M. Beijerinck (1890)
           3 Genus Tetraedron Kützing (1845)
           4 Genus Ankistrodesmus Corda (1838)
           5 Genus Monoraphidium Komárková-Legnerová, in Fott (1969)
           6 Genus Selenastrum Reinsch (1867)
           7 Genus Chodatella Lemmermann (1898)
           8 Genus Franceia Lemmermann (1898)
           9 Genus Lagerheimia R. Chodat