Accacladium serpentulus Odhner, 1928 accepted as Accacladium serpentulum Odhner, 1928 (redescription)
Aephnidiogenes barbarus Nicoll, 1915 (redescription)
Aephnidiogenes major Yamaguti, 1934 (original description)
Aephnidiogenidae Yamaguti, 1934 (original description)
Allocreadium hasu Ozaki, 1926 (redescription)
Allocreadium japonicum Ozaki, 1926 (redescription)
Anisoporus cobraeformis Ozaki, 1928 (redescription)
Aponurus Looss, 1907 (additional source)
Aponurus brevicaudatus Yamaguti, 1934 (original description)
Aponurus rhinoplagusiae Yamaguti, 1934 (original description)
Aponurus vitellograndis Layman, 1930 accepted as Hysterolecitha vitellograndis (Layman, 1930) Skrjabin & Guschanskaja, 1954 (additional source)
Aporocotyle orientalis Yamaguti, 1934 (original description)
Asymphylodora macrostoma Ozaki, 1925 accepted as Asymphylodora innominata (Faust, 1924) Shimazu, Urabe & Grygier, 2011 (redescription)
Azygia anguillae Ozaki, 1924 (redescription)
Bianium hemistoma (Ozaki, 1928) Yamaguti, 1934 (new combination reference)
Bianium hemistoma (Ozaki, 1928) Yamaguti, 1934 (redescription)
Biovarium Yamaguti, 1934 (original description)
Biovarium cryptocotyle Yamaguti, 1934 (original description)
Bivesicula Yamaguti, 1934 (original description)
Bivesicula claviformis Yamaguti, 1934 (original description)
Bivesiculidae Yamaguti, 1934 (original description)
Brachyphallus crenatus (Rudolphi, 1802) Odhner, 1905 (redescription)
Bucephalopsis elongatus Ozaki, 1928 accepted as Prosorhynchoides elongatus (Ozaki, 1928) Bott & Cribb, 2005 (redescription)
Bucephalus uranoscopi Yamaguti, 1934 (original description)
Caudotestis Yamaguti, 1934 accepted as Neoplagioporus Shimazu, 1990 accepted as Urorchis Ozaki, 1927 (original description)
Caudotestis gnathopogonis Yamaguti, 1934 accepted as Neoplagioporus elongatus (Goto & Ozaki, 1930) Shimazu, 1990 accepted as Urorchis elongatus (Goto & Ozaki, 1930) Itsukushim, Gosho, Tsuchida & Urabe, 2025 (original description)
Caudotestis orientalis Yamaguti, 1934 accepted as Neoplagioporus elongatus (Goto & Ozaki, 1930) Shimazu, 1990 accepted as Urorchis elongatus (Goto & Ozaki, 1930) Itsukushim, Gosho, Tsuchida & Urabe, 2025 (original description)
Caudotestis zacconis Yamaguti, 1934 accepted as Neoplagioporus zacconis (Yamaguti, 1934) Shimazu, 1990 accepted as Urorchis zacconis (Yamaguti, 1934) Itsukushima, Gosho, Tsuchida & Urabe, 2025 (original description)
Cephaloporinae Yamaguti, 1934 (original description)
Cephaloporus Yamaguti, 1934 (original description)
Cephaloporus monacanthi Yamaguti, 1934 (original description)
Choanostoma Yamaguti, 1934 accepted as Choanotrema Nitta & Tanaka, 2018 (original description)
Choanostoma plectorhynchi Yamaguti, 1934 accepted as Choanotrema plectorhynchi (Yamaguti, 1934) Nitta & Tanaka, 2018 (original description)
Coitocaecum glandulosum Yamaguti, 1934 accepted as Coitocaecum gymnophallum Nicoll, 1915 (original description)
Coitocaecum latum Ozaki, 1929 (redescription)
Coitocaecum plagiorchis Ozaki, 1926 (redescription)
Cryptogonimidae Ward, 1917 (additional source)
Decemtestis Yamaguti, 1934 (original description)
Decemtestis azumae (Layman, 1930) Yamaguti, 1934 (new combination reference)
Decemtestis callionymi Yamaguti, 1934 (original description)
Decemtestis ditrematis Yamaguti, 1934 (original description)
Decemtestis sillagonis Yamaguti, 1934 (original description)
Derogenes varicus (Müller, 1784) Looss, 1901 (redescription)
Didymocystis reniformis Ariola, 1902 (redescription)
Didymocystis wedli Ariola, 1902 accepted as Didymosulcus wedli (Ariola, 1902) (redescription)
Didymozoon Taschenberg, 1879 (additional source)
Didymozoon minor Yamaguti, 1934 (original description)
Dinurus coryphaenae Yamaguti, 1934 (original description)
Dinurus euthynni Yamaguti, 1934 (original description)
Dinurus scombri Yamaguti, 1934 (original description)
Diphterostomum brusinae (Stossich, 1888) Stossich, 1904 (redescription)
Diplobulbus Yamaguti, 1934 (original description)
Diplobulbus calotomi Yamaguti, 1934 (original description)
Discogaster Yamaguti, 1934 nec Burmeister, 1835 accepted as Discogastroides Strand, 1934 accepted as Paradiscogaster Yamaguti, 1934 (original description)
Discogaster minor Yamaguti, 1934 accepted as Paradiscogaster ostracii (Yamaguti, 1934) Cribb, Anderson & Bray, 1999 (original description)
Discogaster ostracionis Yamaguti, 1934 accepted as Paradiscogaster ostracii (Yamaguti, 1934) Cribb, Anderson & Bray, 1999 (original description)
Dolichoenterum longissimum Ozaki, 1924 (redescription)
Echinostephanus Yamaguti, 1934 accepted as Stephanostomum Looss, 1899 (original description)
Echinostephanus hispidus Yamaguti, 1934 accepted as Stephanostomum hispidum (Yamaguti, 1934) Manter, 1940 (original description)
Ectenurus hamati Yamaguti, 1934 accepted as Erilepturus hamati (Yamaguti, 1934) Manter, 1947 (original description)
Ectenurus paralichthydis Yamaguti, 1934 accepted as Erilepturus hamati (Yamaguti, 1934) Manter, 1947 (original description)
Ectenurus platycephali Yamaguti, 1934 accepted as Erilepturus hamati (Yamaguti, 1934) Manter, 1947 (original description)
Genarchopsis goppo Ozaki, 1925 (redescription)
Genolinea aburame Yamaguti, 1934 (original description)
Genolinea anura (Layman, 1930) Manter, 1954 (status source)
Gonocerca kobayashii (Layman, 1930) Manter, 1934 (redescription)
Gotonius facilis Ozaki, 1924 accepted as Prosorhynchus facilis (Ozaki, 1924) Eckmann, 1932 (redescription)
Gotonius platycephali Yamaguti, 1934 accepted as Prosorhynchus platycephali (Yamaguti, 1934) Srivastava, 1938 (original description)
Gyliauchen papillatus (Goto & Matsudaira, 1918) Goto, 1919 (redescription)
Hamacreadium epinepheli Yamaguti, 1934 accepted as Cainocreadium epinepheli (Yamaguti, 1934) Durio & Manter, 1968 (original description)
Hamacreadium lethrini Yamaguti, 1934 (original description)
Haplosplanchnus pachysoma (Eysenhardt, 1829) Looss, 1902 (redescription)
Helicometra epinepheli Yamaguti, 1934 (original description)
Helicometra hypodytis Yamaguti, 1934 accepted as Helicometra fasciata (Rudolphi, 1819) Odhner, 1902 (original description)
Helicometroides Yamaguti, 1934 (original description)
Helicometroides longicollis Yamaguti, 1934 (original description)
Hemiurus odhneri Yamaguti, 1934 accepted as Hemiurus levinseni Odhner, 1905 (original description)
Hexangium sigani Goto & Ozaki, 1929 (redescription)
Hypohepaticola Yamaguti, 1934 (original description)
Hypohepaticola callionymi Yamaguti, 1934 (original description)
Hysterolecitha microrchis Yamaguti, 1934 accepted as Thulinia microrchis (Yamaguti, 1934) Bray, Cribb & Barker, 1993 (original description)
Hysterolecithoides Yamaguti, 1934 (original description)
Hysterolecithoides epinepheli Yamaguti, 1934 (original description)
Isocoelium mediolecithale Ozaki, 1927 (redescription)
Isoparorchis trisimilitubis Southwell, 1913 (redescription)
Lebouria calotomi Yamaguti, 1934 accepted as Choerodonicola calotomi (Yamaguti, 1934) Cribb, 2005 (original description)
Lebouria choerodonis Yamaguti, 1934 accepted as Choerodonicola choerodontis (Yamaguti, 1934) Cribb, 2005 (original description)
Lebouria lobata Yamaguti, 1934 accepted as Plagioporus lobatus (Yamaguti, 1934) Manter, 1947 accepted as Neolebouria lobata (Yamaguti, 1934) Gibson, 1976 accepted as Mesobathylebouria lobata (Yamaguti, 1934) Martin, Huston, Cutmore & Cribb, 2019 (original description)
Lecithaster salmonis Yamaguti, 1934 accepted as Opistholecithum salmonis (Yamaguti, 1934) Vainutis & Voronova, 2025 accepted as Alloopistholecithum salmonis (Yamaguti, 1934) Vainutis & Voronova, 2025 (original description)
Lecithaster stellatus Looss, 1907 (redescription)
Lecithocladium excisiforme Cohn, 1902 (redescription)
Lecithocladium excisum (Rudolphi, 1819) Lühe, 1901 (redescription)
Lecithocladium magnacetabulum Yamaguti, 1934 (original description)
Lecithocladium pagrosomi Yamaguti, 1934 (original description)
Lecithocladium psenopsis Yamaguti, 1934 (original description)
Lepodora gadi Yamaguti, 1934 accepted as Lepidapedon gadi (Yamaguti, 1934) Acena, 1947 (original description)
Lepotrema clavatum Ozaki, 1932 (redescription)
Lintonium vibex (Linton, 1900) Stunkard & Nigrelli, 1930 (redescription)
Macrolecithus gotoi Hasegawa & Ozaki, 1926 accepted as Allocreadium gotoi (Hasegawa & Ozaki, 1926) Shimazu, 1988 (redescription)
Maculifer japonicus Layman, 1931 (redescription)