Kingdom Protoctista Hogg, 1860
   Phylum Chlorophyta Pascher (1914) - green algae
     Class Chlorophyceae Wille (1884) - chlorophytes
       Order Chlorococcales Pascher see Order Chlamydomonadales F.E. Fritsch
         01 Family Coccomyxaceae G.M. Sm.
         02 Family Chlorococcaceae Blackman & Tansley
         03 Family Characiaceae (Nägeli) Wittrock
         04 Family Chlorochytriaceae
         05 Family Rhodochytriaceae see Family Chlorochytriaceae
         06 Family Micractiniaceae G.M. Sm.
         07 Family Hydrodictyaceae Dumort.
         08 Family Protosiphonaceae Blackman & Tansley
         09 Family Characiosiphonaceae Iyengar
         10 Family Hormotilaceae Korshikov
         11 Family Palmodictyaceae see Family Radiococcaceae Fott ex P.C.Silva
         12 Family Oocystaceae Bohlin
         13 Family Scenedesmaceae Oltmanns
         14 Family Eremosphaeraceae
         15 Family Treubariaceae (Korshikov) Fott
         16 Family Dictyosphaeriaceae G.S.West
         17 Family Botryococcaceae Wille
         18 Family Heleochloridaceae Fott (1974)