Kingdom Protoctista Hogg, 1860
   Phylum Ciliophora Doflein, 1901 - ciliates
     Subphylum Postciliodesmatophora Gerassimova & Seravin, 1976 - desmates
       1 Class Karyorelictea Corliss, 1974
       2 Class Spirotrichea Bütschli, 1889