Kingdom Protoctista Hogg, 1860
   Phylum Chlorophyta Pascher (1914) - green algae
     Class Chlorophyceae Wille (1884) - chlorophytes
       Order Tetrasporales Lemmermann see Order Chlamydomonadales F.E. Fritsch
         Family Nautococcaceae
           1 Genus Nautococcus Korshikov (1926)
           2 Genus Nautococcopsis Geitler (1943)
           3 Genus Actinochloris O. Korshikov (1953)
           4 Genus Apiococcus A. Korshikov (1926)
           5 Genus Hypnomonas Korshikov (1926)