Protozoa Goldfuss, 1818 - protozoans Phylum Ciliophora Doflein, 1901 - ciliates Class Polyhymenophorea - spirotrichs see Class Spirotrichea Bütschli, 1889 1 Class Kinetofragminophorea - kinetofragminophoreans see Phylum Ciliophora Doflein, 1901 2 Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans