Trematoda Rudolphi, 1808
Acanthocotylidae Price, 1936
Bothitrematidae Bychowsky, 1957
Calceostomatidae Parona & Perugia, 1890
Capsalidae Baird, 1853
Dactylogyridae Yamaguti, 1963
Dionchidae Bychowsky, 1959
Diplectanidae Bychowsky, 1957
Gyrodactylidae Cobbold, 1864
Loimoidae Bychowsky, 1957
Microbothriidae Price, 1936
Monocotylidae Taschenberg, 1879
Protogyrodactylidae Johnston & Tiegs, 1922
Tetraonchidae Bychowsky, 1957
Tetraonchoididae
Udonellidae Taschenberg, 1879
