Phylum Ciliophora Doflein, 1901 - ciliates
   Subphylum Postciliodesmatophora Gerassimova & Seravin, 1976 - desmates
     Class Heterotrichea Stein, 1859
       Order Heterotrichida Stein, 1859 - heterotrichs
         1 Family Folliculinidae Dons, 1914
         2 Family Blepharismidae Jankowski, in Small & Lynn, 1985
         3 Family Chattonidiidae Villeneuve-Brachon, 1940
         4 Family Climacostomidae Repak, 1972
         5 Family Condylostomatidae Kahl, in Doflein & Reichenow, 1929
         6 Family Maristentoridae W. Miao et al., 2005
         7 Family Peritromidae Stein, 1867
         8 Family Spirostomidae Stein, 1867
         9 Family Stentoridae Carus, 1863