Kingdom Protoctista Hogg, 1860
   Phylum Chrysophyta Pascher (1914) see Class Chrysophyceae Fritsch (1927)
     1 Class Chrysophyceae Fritsch (1927)
     2 Class Synurophyceae Andersen (1987) see Class Chrysophyceae Fritsch (1927)
     3 Class Pedinellophyceae Moehn (1984), nom. inval. see Class Pedinellophyceae Moehn ex Doweld (2001)
     4 Class Dictyochophyceae Silva (1980)
     5 Class Silicomastigota see Class Dictyochophyceae Silva (1980)