Kingdom Protista (Haeckel, 1866) - protists Phylum Ciliophora Doflein, 1901 - ciliates 1 Class Kinetofragminophorea - kinetofragminophoreans see Phylum Ciliophora Doflein, 1901 2 Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans 3 Class Polyhymenophorea - spirotrichs see Class Spirotrichea Bütschli, 1889