Allopseudocolocyntotrema Yamaguti, 1970 (additional source)
Allopseudocolocyntotrema alioshkini Pozdnyakov, 1994 (redescription)
Coeliotrema Yamaguti, 1938 (additional source)
Coeliotrema thynni Yamaguti, 1938 (redescription)
Didymocystis Ariola, 1902 (additional source)
Didymodiclinus Pozdnyakov, 1993 (additional source)
Didymodiclinus facialis (Baylis, 1938) Pozdnyakov, 1996 (new combination reference)
Didymosulcus Pozdnyakov, 1990 (additional source)
Didymosulcus philobranchia (Yamaguti, 1970) Pozdnyakov, 1990 (redescription)
Didymosulcus wedli (Ariola, 1902) (status source)
Didymozoidae Monticelli, 1888 (taxonomy source)
Didymozoon Taschenberg, 1879 (additional source)
Didymozoon serrani Monticelli, 1889 (status source)
Didymozoon taenioides Monticelli, 1883 (status source)
Gonapodasmius Ishii, 1935 (additional source)
Halvorsenius Gibson, MacKenzie & Cottle, 1981 (additional source)
Koellikeria Cobbold, 1860 (additional source)
Koellikeria exocoeti (Parona & Perugia, 1893) MacCallum & MacCallum, 1916 (status source)
Koellikerioides Yamaguti, 1970 (additional source)
Koellikerioides orientalis (Yamaguti, 1934) Pozdnyakov, 1992 (redescription)
Maccallumtrema Yamaguti, 1970 (additional source)
Metanematobothrium Yamaguti, 1938 (additional source)
Nematobothrium van Beneden, 1858 (additional source)
Nematobothrium benedenii (Monticelli, 1893) Maclaren, 1904 (status source)
Nematobothrium scombri (Taschenberg, 1879) Ishii, 1935 (redescription)
Oesophagocystis Yamaguti, 1970 (additional source)
Oesophagocystis lydiae Pozdnyakov, 1994 (redescription)
Platocystis Yamaguti, 1938 (additional source)
Platocystis alalongae Yamaguti, 1938 (redescription)
Unitubulotestis Yamaguti, 1953 (additional source)
Unitubulotestis pelamydis (Taschenburg, 1879) Nikolaeva, 1980 (redescription)
Wedlia Cobbold, 1860 (additional source)
Wedlia bipartita (Wedl, 1855) Cobbold, 1860 (redescription)