eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 - protozoa
     Subkingdom Dictyozoa Cavalier-Smith, 1991
       Branch Bikonta Cavalier-Smith, 1993
         Infrakingdom Neozoa Cavalier-Smith, 1993
           Parvkingdom Alveolata Cavalier-Smith, 1991 see Superphylum Alveolata Cavalier-Smith, 1991
             Phylum Dinozoa Cavalier-Smith, 1981 see Infraphylum Dinozoa Cavalier-Smith, 1981
               Subphylum Dinoflagellata Bütschli, 1885 see Superclass Dinoflagellata Bütschli, 1885
                 Class Peridinea Ehrenberg, 1830
                   Order Ptychodiscida Fensome, Taylor, Norris, Sarjeant, Wharton & Williams, 1993 see Order Ptychodiscales Fensome, F.J.R. Taylor, G. Norris, Sarjeant, Wharton & G.L. Williams (1993)