Family RADIOPHRYIDAE de Puytorac, 1972

Body generally ovoid and flattened, occasionally elongate; apical and dominated by prominent inverted "V"-shaped cytoskeletal organelle onto which numerous fibers converge; hooks or spines or other attachment fixtures often present; body ciliation dense; one or two rows of contractile vacuoles; chain formation not common; commensals of aquatic and terrestrial oligochaetes, a few polychaetes, and occasionally a fresh-water lamellibranch mollusc.

Acanthodiophrya de Puytorac & Dragesco, 1968. Single species.
Anthonyella Delphy, 1936. Few species.
Cheissinophrya de Puytorac & Dragesco, 1969. Single species.
Coelophrya de Puytorac & Dragesco, 1968. Single species.
Desmophrya Raabe, 1933. Single species. V 12k.
Dicoelophrya de Puytorac & Dragesco, 1968. Few species.
Durchoniella de Puytorac, 1954. Few to several species.
Eudrilophrya de Puytorac, 1971. Single species.
Helella Kaczanowski, 1961 (syns. Hellela, Hellella). Few species.
Hovasseiella de Puytorac, 1955. Single species.
Metaracoelophrya de Puytorac & Dragesco, 1969. Single species.
Metaradiophrya Heidenreich, 1935. Many species.
Mimophrya de Puytorac, 1969. Few species.
Mrazekiella Kijenskij, 1925. Few species.
Ochridanus Georgévitch, 1941. Few species.
Paracoelophrya de Puytorac, 1969. Few species.
Radiophrya Rossolimo, 1926 (syns. Cheissinella, Cheissiniella). Many species.
Radiophryopsis Georgévitch, 1941. Single species.