Phylum Heterokonta Caval.-Sm. (1986) see Superphylum Heterokonta Caval.-Sm. (1986)
   Subphylum Ochrista Caval.-Sm. (1986), orth. inval. see Phylum Ochrista Caval.-Sm. (1995)
     Infraphylum Raphidoista Caval.-Sm. (1986)
       Superclass Dictyochia Haeckel (1894)
         Class Actinochrysea Caval.-Sm. (1995) see Class Dictyochophyceae Silva (1980)
           Subclass Dictyochidae Haeckel (1894) see Class Dictyochophyceae Silva (1980)
             Order Rhizochromulinales O'Kelly & Wujek (1995) see Order Pedinellales Zimmermann et al. (1984)
               Family Rhizochromulinaceae O'Kelly & Wujek (1994)
                 1 Genus Rhizochromulina Len.