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 Tetrasporaceae Wittr. (1872), nom. cons.
           1 Genus Tetraspora J.H.F. Link ex N.A. Desv. (1818)
           2 Genus Fottiella Ettl (1955)
           3 Genus Paulschulzia Skuja (1948)
           4 Genus Apiocystis Nägeli (1849)