Protozoa Goldfuss, 1818 - protozoans Phylum Ciliophora Doflein, 1901 - ciliates Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans Subclass Peritrichia Stein, 1859 Order Peritrichida Stein, 1859 see Subclass Peritrichia Stein, 1859