Protozoa Goldfuss, 1818 - protozoans
   Phylum Sarcomastigophora Honigberg & Balamuth, 1963
     Subphylum Mastigophora Diesing, 1866 - flagellates
       Class Phytomastigophorea Calkins, 1909 - photosynthetic flagellates
         Order Chloromonadida see Class Raphidophyceae Chadef. ex P.C.Silva (1980)
         Order Chrysomonadida - chrysomonads see Class Chrysophyceae Fritsch (1927)
         Order Cryptomonadida Senn, 1900 - cryptomonads see Order Cryptomonadales Pascher (1913)
         Order Dinoflagellida - dinoflagellates see Phylum Dinoflagellata Engl. (1903)
         Order Euglenida Bütschli, 1884 - euglenids
         Order Heterochlorida see Order Chloramoebales
         Order Prasinomonadida see Class Prasinophyceae T. Christensen, 1962 ex Ø. Moestrup & J. Throndsen (1988)
         Order Prymnesiida Cavalier-Smith see Phylum Haptophyta D.J. Hibberd ex Edvardsen & Eikrem (2000)
         Order Silicoflagellida - silicoflagellates see Class Dictyochophyceae Silva (1980)
         Order Volvocida Francé, 1894, orth. zool. - volvocids see Order Chlamydomonadales F.E. Fritsch