Allocreadioidea Looss, 1902 accepted as Gorgoderoidea Looss, 1901 (basis of record)
Aphalloides Dollfus, Chabaud & Golvan, 1957 (basis of record)
Aphalloides coelomicola Dollfus, Chabaud & Golvan, 1957 (basis of record)
Aphallus Poche, 1926 (basis of record)
Aphallus tubarium (Rudolphi, 1819) Poche, 1926 (basis of record)
Aphanurus Looss, 1907 (basis of record)
Aphanurus stossichii (Monticelli, 1891) Looss, 1907 (basis of record)
Aponurus Looss, 1907 (basis of record)
Ascocotyle Looss, 1899 (basis of record)
Bucephalidae Poche, 1907 (basis of record)
Bucephaloidea Poche, 1907 (basis of record)
Bucephalus von Baer, 1827 (basis of record)
Bucephalus marinus Vlasenko, 1931 (basis of record)
Bunocotyle Odhner, 1928 (basis of record)
Bunocotyle cingulata Odhner, 1928 (basis of record)
Cryptocotyle Lühe, 1899 (basis of record)
Cryptocotyle concava (Creplin, 1825) Lühe, 1899 (basis of record)
Cryptogonimidae Ward, 1917 (basis of record)
Derogenidae Nicoll, 1910 (basis of record)
Dicrogaster Looss, 1902 (basis of record)
Digenea (basis of record)
Diplostomidae Poirier, 1886 (basis of record)
Diplostomoidea Poirier, 1886 (basis of record)
Diplostomum von Nordmann, 1832 (basis of record)
Diplostomum pseudospathaceum Niewiadomska, 1984 (basis of record)
Diplostomum rutili Razmashkin, 1969 (basis of record)
Diplostomum spathaceum (Rudolphi, 1819) Olsson, 1876 (basis of record)
Gaevskajatrema Gibson & Bray, 1982 (basis of record)
Gaevskajatrema perezi (Mathias, 1926) Gibson & Bray, 1982 (basis of record)
Galactosomum Looss, 1899 (basis of record)
Galactosomum lacteum (Jägerskiöld, 1896) Looss, 1899 (basis of record)
Galactosomum phalacrocoracis Yamaguti, 1939 (basis of record)
Gorgoderidae Looss, 1899 (basis of record)
Haploporidae Nicoll, 1914 (basis of record)
Haploporus Looss, 1902 (basis of record)
Haploporus benedenii (Stossich, 1887) Looss, 1902 (basis of record)
Haplosplanchnidae Poche, 1926 (basis of record)
Haplosplanchnus Looss, 1902 (basis of record)
Haplosplanchnus pachysomus (Eysenhardt, 1829) Looss, 1902 accepted as Haplosplanchnus pachysoma (Eysenhardt, 1829) Looss, 1902 (basis of record)
Helicometra Odhner, 1902 (basis of record)
Helicometra fasciata (Rudolphi, 1819) Odhner, 1902 (basis of record)
Hemiuridae Looss, 1899 (basis of record)
Hemiuroidea Looss, 1899 (basis of record)
Heterophyidae Leiper, 1909 (basis of record)
Lecithaster Lühe, 1901 (basis of record)
Lecithasteridae Odhner, 1905 (basis of record)
Lecithochirium Lühe, 1901 (basis of record)
Lecithochirium rufoviride (Rudolphi, 1819) Lühe, 1901 (basis of record)
Magnibursatus Naidenova, 1969 (basis of record)
Monorchiidae Odhner, 1911 (basis of record)
Monorchis Monticelli, 1893 (basis of record)
Monorchis monorchis (Stossich, 1890) Looss, 1902 (basis of record)
Notocotylidae Lühe, 1909 (basis of record)
Opecoelidae Ozaki, 1925 (basis of record)
Opisthorchiidae Looss, 1899 (basis of record)
Opisthorchioidea Looss, 1899 (basis of record)
Peracreadium Nicoll, 1909 (basis of record)
Peracreadium genu (Rudolphi, 1819) Nicoll, 1909 (basis of record)
Phyllodistomum Braun, 1899 (basis of record)
Phyllodistomum acceptum Looss, 1901 (basis of record)
Plagiorchiida (basis of record)
Pygidiopsis Looss, 1907 (basis of record)
Pygidiopsis genata Looss, 1907 (basis of record)
Saccocoelium Looss, 1902 (basis of record)
Saccocoelium obesum Looss, 1902 (basis of record)
Saccocoelium tensum Looss, 1902 (basis of record)
Saturnius Manter, 1969 (basis of record)
Saturnius papernai Overstreet, 1977 (basis of record)
Timoniella Rebecq, 1960 (basis of record)
Timoniella imbutiforme (Molin, 1859) Brooks, 1980 accepted as Timoniella imbutiformis (Molin, 1859) Brooks, 1980 (basis of record)
Tylodelphys Diesing, 1850 (basis of record)
Tylodelphys clavata (von Nordmann, 1832) Diesing, 1850 (basis of record)