Acanthostomidae (basis of record)
Allodiscocotylidae Tripathi, 1959 (basis of record)
Aspidoderidae Skrjabin & Schikhobalova, 1947 (basis of record)
Bicotylophoridae Amato, 1994 accepted as Discocotylidae Price, 1936 (basis of record)
Callodistomidae Odhner, 1910 (basis of record)
Chauhaneidae Euzet & Trilles, 1960 (basis of record)
Diplangidae Yamaguti, 1971 (basis of record)
Diplotriaenidae Skrjabin, 1916 (basis of record)
Monticelliidae La Rue, 1911 (basis of record)
Neotetraonchidae Bravo-Hollis, 1968 (basis of record)
Neothoracocotylidae Lebedev, 1969 accepted as Thoracocotylidae Price, 1936 (basis of record)
Proterodiplostomidae Dubois, 1936 (basis of record)
Ransomnematidae Travassos, 1930 (basis of record)
Skrjabingylidae Skrjabin, 1933 (basis of record)
Viannaiidae Neveu-Lemaire, 1944 (basis of record)