Phylum Ciliophora Doflein, 1901 - ciliates Subphylum Intramacronucleata Lynn, 1996 - amphiesmates Class Spirotrichea Bütschli, 1889 Subclass Hypotrichia (Stein, 1859) Cavalier-Smith, 1993 Order Kiitrichida Nozawa, 1941