1. Subfamily --Monocotylinae Gamble, 1896 



2. Subfamily- -Dasybatotreminae Bychowsky, 1957 



3. Subfamily --Calicotylinae Monticelli, 1903 



4. Subfamily- -Merizocotylinae Johnston and 



Tiegs, 1922 



b. Fannily--Lioimoidae Bychowsky, 1957 



c. Family --Dionchidae Bychowsky, 1957 



d. Family--Capsalidae Baird, 1853 



1. Subfamily- -Capsalinae Johnston, 1929 



2. Subfamily --Megalocotylinae Bychowsky, 1957 



3. Subfannily--Trochopodinae (Price, 1936) 



Sproston, 1946 



4. Subfamily- -Entobdellinae Bychowsky, 1957 



5. Subfannily--Encotyllabinae Monticelli, 1892 



6. Subfamily- -Nitzschiinae Johnston, 1931 



e. Family- -Acanthocotylidae Price, 1936 



1. Subfamily- -Acanthocotylinae Monticelli, 1903 



2. Subfamily- -Enoplocotylinae Tagliani, 1912 



f. Family Microbothriidae Price, 1936 



B. Order--Tetraonchidea Bychowsky, 1957 



a. Fannily-Tetraonchidae Bychowsky, 1937 



b. Family— Amphibdellatidae (Carus, 1885) 



Bychowsky, 1957 



c. Family- -Tetraonchoididae Bychowsky, 1951 



d. Family- -Bothitrematidae Bychowsky, 1957 



C. Order- -Gyrodactylidea Bychowsky, 1937 



1. Suborder- -Gyrodactylinea Bychowsky, 1937 p. 341 



a. Family --Gyrodactylidae (van Beneden et Hesse, 1863) 



Cobbold, 1864 



2. Suborder- -Polyopisthocotylinea (Odhner, 1912) 



Bychowsky 1937 



a. Family- -Poly stomatidae (Carus, 1863) Gamble, 1896 



b. Family- -Sphyranuridae Poche, 1925 



Subclass --Oligonchoinea Bychowsky, 1937 



A. Order--Diclybothriidea Bychowsky, 1957 



a. Family- -Diclybothriidae Bychowsky et Gussew, 1950 



b. Family- -Hexabothriidae Price, 1942 



B. Order--Chimaericolidea (Brinknnann, 1952) Bychowsky, 1957 



a. Family- -Chimaericolidae Brinkmann, 1942 



C. Order--Mazocraeidae Bychowsky, 1957 



1. Suborder- -Mazocraeinae Bychowsky, 1957 



402 



