Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Chlorophyta Pascher (1914) - green algae
     prasinophytes
       Pycnococcaceae R.R.L. Guillard (1991)
         Genus Pycnococcus R.R.L. Guillard (1991)
           1 Pycnococcus provasolii R. Guillard (1991)