Ancyrocephaloides Yamaguti, 1938 (original description)
Ancyrocephaloides triacanthi Yamaguti, 1938 (original description)
Axine (Axine) Abildgaard, 1794 accepted as Axine Abildgaard, 1794 (redescription)
Axine (Axine) constricta Yamaguti, 1938 represented as Axine constricta Yamaguti, 1938 accepted as Neoaxine constricta (Yamaguti, 1938) Price, 1946 (original description)
Axine (Axinoides) Yamaguti, 1938 accepted as Axinoides Yamaguti, 1938 (original description)
Axine (Axinoides) tylosuri Yamaguti, 1938 accepted as Axine tylosuri Yamaguti, 1938 accepted as Axinoides tylosuri Yamaguti, 1938 (original description)
Bathycotyle coryphaenae Yamaguti, 1938 accepted as Bathycotyle branchialis Darr, 1902 (original description)
Coeliotrema Yamaguti, 1938 (original description)
Coeliotrema thynni Yamaguti, 1938 (original description)
Cyclobothrium semicossyphi Yamaguti, 1938 (original description)
Cyclobothrium sessilis (Goto, 1894) Cerfontaine, 1895 accepted as Cyclobothrium sessile (Goto, 1894) Cerfontaine, 1895 (redescription)
Dactylogyrus inversus Goto & Kikuchi, 1917 (redescription)
Diclidophora elongata Goto, 1894 accepted as Choricotyle elongata (Goto, 1894) Llewellyn, 1941 (redescription)
Didymocylindrus filiformis Ishii, 1935 (redescription)
Didymocystis abdominalis Yamaguti, 1938 (original description)
Didymocystis acanthocybii Yamaguti, 1938 (original description)
Didymocystis alalongae Yamaguti, 1938 (original description)
Didymocystis dissimilis Yamaguti, 1938 accepted as Oesophagocystis dissimilis (Yamaguti, 1938) Yamaguti, 1970 (original description)
Didymocystis miliaris Yamaguti, 1938 (original description)
Didymocystis opercularis Yamaguti, 1938 (original description)
Didymocystis submentalis Yamaguti, 1938 (original description)
Didymoproblema fusiforme Ishii, 1935 accepted as Didymocylindrus fusiformis (Ishii, 1935) Pozdnyakov, 1966 (redescription)
Didymozoon branchiale Yamaguti, 1938 accepted as Indodidymozoon branchiale (Yamaguti, 1938) Anderson & Cribb, 1994 (original description)
Didymozoon brevicolle Yamaguti, 1938 accepted as Indodidymozoon brevicolle (Yamaguti, 1938) Anderson & Cribb, 1994 (original description)
Didymozoon koti Yamaguti, 1938 accepted as Indodidymozoon koti (Yamaguti, 1938) Anderson & Cribb, 1994 (original description)
Didymozoon longicolle Ishii, 1935 (additional source)
Didymozoon spirale Yamaguti, 1938 accepted as Helicodidymozoon spirale (Yamaguti, 1938) Anderson & Cribb, 1994 (original description)
Diplectanum epinepheli Yamaguti, 1938 accepted as Pseudorhabdosynochus epinepheli (Yamaguti, 1938) Kritsky & Beverley-Burton, 1986 (original description)
Diplotrema Yamaguti, 1938 accepted as Neodiplotrema Yamaguti, 1938 (original description)
Diplotrema pelamydis Yamaguti, 1938 accepted as Neodiplotrema pelamydis (Yamaguti, 1938) Yamaguti, 1970 (original description)
Discocotyle dorosomatis Yamaguti, 1938 accepted as Neomazocraes dorosomatis (Yamaguti, 1938) Price, 1943 (original description)
Gastrocotyle trachuri Van Beneden & Hesse, 1863 (redescription)
Gonapodasmius pacificus Yamaguti, 1938 accepted as Didymodiclinus pacificus (Yamaguti, 1938) Pozdnyakov, 1993 (original description)
Gonapodasmius pristipomatis (Yamaguti, 1934) Yamaguti, 1938 accepted as Didymodiclinus pristipomatis (Yamaguti, 1934) Pozdnyakov, 1994 (redescription)
Gonapodasmius pristipomatis (Yamaguti, 1934) Yamaguti, 1938 accepted as Didymodiclinus pristipomatis (Yamaguti, 1934) Pozdnyakov, 1994 (new combination reference)
Hirudinella spinulosa Yamaguti, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853 (original description)
Lamellodiscus pagrosomi Murray, 1931 (redescription)
Lobatozoum multisacculatum Ishii, 1935 (redescription)
Metanematobothrium Yamaguti, 1938 (original description)
Metanematobothrium guernei (Moniez, 1891) Yamaguti, 1938 (redescription)
Metanematobothrium guernei (Moniez, 1891) Yamaguti, 1938 (new combination reference)
Microcotyle caudata Goto, 1894 (redescription)
Microcotyle mugilis Vogt, 1878 accepted as Solostamenides mugilis (Vogt, 1879) Unnithan, 1971 (redescription)
Microcotyle tai Yamaguti, 1938 accepted as Bivagina tai (Yamaguti, 1938) Yamaguti, 1963 (original description)
Nematobothrium filiforme Yamaguti, 1934 (redescription)
Nematobothrium sabae Ishii, 1935 accepted as Nematobothrium filiforme Yamaguti, 1934 (source of synonymy)
Nematobothrium scombri (Taschenberg, 1879) Ishii, 1935 (redescription)
Paragonapodasmius Yamaguti, 1938 (original description)
Paragonapodasmius managatuwo Yamaguti, 1938 (original description)
Parancyrocephaloides Yamaguti, 1938 (original description)
Parancyrocephaloides daicoci Yamaguti, 1938 (original description)
Platocystis Yamaguti, 1938 (original description)
Platocystis alalongae Yamaguti, 1938 (original description)
Pseudaxine trachuri Parona & Perugia, 1890 (redescription)
Pseudoctocotyla Yamaguti, 1938 accepted as Mazocraeoides Price, 1936 (original description)
Pseudoctocotyla dorosomatis Yamaguti, 1938 accepted as Mazocraeoides dorosomatis (Yamaguti, 1938) Sproston, 1946 (original description)
Rajonchocotyle kenojei Yamaguti, 1938 (original description)
Syncoelium katuwo Yamaguti, 1938 accepted as Copiatestes filiferus (Leuckart in Sars, 1885) Gibson & Bray, 1977 (original description)
Synodus japonicus (basis of record)
Tetrancistrum sigani Goto & Kikuchi, 1917 (redescription)
Tetrochetus hamadai Fukui & Ogata, 1935 accepted as Tetrochetus coryphaenae Yamaguti, 1934 (redescription)
Thoracocotyle coryphaenae Yamaguti, 1938 accepted as Neothoracocotyle coryphaenae (Yamaguti, 1938) Hargis, 1956 accepted as Neothoracocotyle acanthocybii (Meserve, 1938) Hargis, 1956 (original description)
Xystrias grigorjewi (Herzenstein, 1890) accepted as Eopsetta grigorjewi (Herzenstein, 1890) (basis of record)

Ariake Sea for Didymozoon spirale Yamaguti, 1938 
Ariake Sea for Microcotyle mugilis Vogt, 1878 
Central Kuroshio Current for Ancyrocephaloides Yamaguti, 1938 
Central Kuroshio Current for Ancyrocephaloides triacanthi Yamaguti, 1938 
Central Kuroshio Current for Axine (Axine) constricta Yamaguti, 1938 
Central Kuroshio Current for Axine (Axinoides) tylosuri Yamaguti, 1938 
Central Kuroshio Current for Discocotyle dorosomatis Yamaguti, 1938 
Central Kuroshio Current for Parancyrocephaloides daicoci Yamaguti, 1938 
Central Kuroshio Current for Pseudaxine trachuri Parona & Perugia, 1890 
Central Kuroshio Current for Pseudoctocotyla dorosomatis Yamaguti, 1938 
Central Kuroshio Current for Rajonchocotyle kenojei Yamaguti, 1938 
Inland Sea off Seto for Cyclobothrium semicossyphi Yamaguti, 1938 
Inland Sea off Seto for Diclidophora elongata Goto, 1894 
Inland Sea off Seto for Diplectanum epinepheli Yamaguti, 1938 
Inland Sea off Seto for Microcotyle tai Yamaguti, 1938 
Japanese Exclusive Economic Zone for Didymocylindrus filiformis Ishii, 1935 
Japanese Exclusive Economic Zone for Didymozoon brevicolle Yamaguti, 1938 
Japanese Exclusive Economic Zone for Didymozoon koti Yamaguti, 1938 
Japanese Exclusive Economic Zone for Didymozoon longicolle Ishii, 1935 
Japanese Exclusive Economic Zone for Nematobothrium filiforme Yamaguti, 1934 
Japanese Exclusive Economic Zone for Nematobothrium scombri (Taschenberg, 1879) Ishii, 1935 
Japanese Exclusive Economic Zone for Tetrochetus hamadai Fukui & Ogata, 1935 
Japanese part of the Inland Sea for Didymozoon branchiale Yamaguti, 1938 
Japanese part of the Inland Sea for Gonapodasmius pristipomatis (Yamaguti, 1934) Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Bathycotyle coryphaenae Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis abdominalis Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis acanthocybii Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis alalongae Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis dissimilis Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis miliaris Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis opercularis Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymocystis submentalis Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Didymoproblema fusiforme Ishii, 1935 
Japanese part of the North Pacific Ocean for Diplotrema pelamydis Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Gonapodasmius pacificus Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Hirudinella spinulosa Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Metanematobothrium guernei (Moniez, 1891) Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Paragonapodasmius managatuwo Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Platocystis alalongae Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Syncoelium katuwo Yamaguti, 1938 
Japanese part of the North Pacific Ocean for Thoracocotyle coryphaenae Yamaguti, 1938 
Osaka Bay for Cyclobothrium sessilis (Goto, 1894) Cerfontaine, 1895 
Osaka Bay for Dactylogyrus inversus Goto & Kikuchi, 1917 
Osaka Bay for Lamellodiscus pagrosomi Murray, 1931 
Osaka Bay for Microcotyle caudata Goto, 1894 
Osaka Bay for Tetrancistrum sigani Goto & Kikuchi, 1917 
Suruga Bay for Coeliotrema thynni Yamaguti, 1938