Protozoa Goldfuss, 1818 - protozoans Phylum Ciliophora Doflein, 1901 - ciliates Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans 1 Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993 - hymenostome ciliates 2 Subclass Hysterocinetia see Subclass Scuticociliatia (E.B. Small, 1967) 3 Subclass Peritrichia Stein, 1859