Kingdom Protoctista Hogg, 1860
   Phylum Chlorophyta Pascher (1914) - green algae
     Class Chlorophyceae Wille (1884) - chlorophytes
       Order Tetrasporales Lemmermann see Order Chlamydomonadales F.E. Fritsch
         1 Family Palmellopsidaceae Korshikov
         2 Family Characiochloridaceae Skuja
         3 Family Chaetochloridaceae
         4 Family Tetrasporaceae Wittr. (1872), nom. cons.
         5 Family Nautococcaceae