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 Ciliomyxa Cavalier-Smith, 1993
             Phylum Opalozoa Cavalier-Smith, 1992 see Subphylum Opalozoa Cavalier-Smith, 1992
               Subphylum Proterozoa Cavalier-Smith, 1991
                 Class Thecomonadea Cavalier-Smith, 1993
                   1 Order Apusomonadida Karpov & Mylnikov, 1989
                   2 Order Cryomonadida Cavalier-Smith, 1993