Kingdom Protoctista Hogg, 1860
Count: [p] 36p;91c;87o;183f;507g;35s;2v
   Phylum Chlorophyta Pascher (1914) - green algae
  Count: [o] 10c;29o;39f;117g
     ?Class Prasinophyceae T. Christensen, 1962 ex Ø. Moestrup & J. Throndsen (1988) - prasinophytes see [unranked] prasinophytes
    Count: [g] 4o;9f;17g
       Order Pyramimonadales Chadefaud
      Count: [g] 3f;5g
         Family Mesostigmataceae Fott ex Moestrup & Throndsen
        Count: [g] 1g
           Genus Mesostigma Lauterborn (1894)
          Count: -