Trematoda Rudolphi, 1808
Botulisaccidae Yamaguti, 1971
Brachylaimidae Joyeux & Foley, 1930
Bucephalidae Larue, 1926
Dinuridae
Fellodistomatidae Nicoll, 1913
Gymnophallidae Morozov, 1955
Harmotrematidae (Yamaguti, 1933) Mehra, 1962
Hasstilesiidae Hall, 1916
Isoparorchiidae Travassos, 1922
Lecithasteridae Odhner, 1905
Lecithochiridae
Leucochloridiidae Dollfus, 1934
Leucochloridiomorphidae Travassos & Kohn, 1966
Liolopidae Odhner, 1912
Monascidae Dollfus, 1952
Monodhelminthidae
Moreauiidae Johnston, 1915
Ovariopteridae Spasski & Kulikov, 1963
Thapariellidae Srivastava, 1953
Urotrematidae Poche, 1926
