Didymocylindrus Ishii, 1935 (original description)
Didymocylindrus filiformis Ishii, 1935 (original description)
Didymocystis bilobata Ishii, 1935 (original description)
Didymocystis crassa Ishii, 1935 (original description)
Didymocystis katsuwonicola (Okada, 1926) Ishii, 1935 accepted as Didymosulcus katsuwonicola (Okada, 1926) Pozdnyakov, 1990 (new combination reference)
Didymocystis katsuwonicola (Okada, 1926) Ishii, 1935 accepted as Didymosulcus katsuwonicola (Okada, 1926) Pozdnyakov, 1990 (redescription)
Didymocystis ovata Ishii, 1935 (original description)
Didymocystis semiglobularis Ishii, 1935 (original description)
Didymocystis simplex Ishii, 1935 accepted as Didymocylindrus simplex (Ishii, 1935) Yamaguti, 1970 (original description)
Didymocystis soleiformis Ishii, 1935 accepted as Didymosulcus soleiformis (Ishii, 1935) (original description)
Didymocystis wedli Ariola, 1902 accepted as Didymosulcus wedli (Ariola, 1902) (redescription)
Didymoproblema Ishii, 1935 accepted as Didymocylindrus Ishii, 1935 (original description)
Didymoproblema fusiforme Ishii, 1935 accepted as Didymocylindrus fusiformis (Ishii, 1935) Pozdnyakov, 1966 (original description)
Didymozoon filicolle Ishii, 1935 (original description)
Didymozoon longicolle Ishii, 1935 (original description)
Gonapodasmiinae Ishii, 1935 (original description)
Gonapodasmius Ishii, 1935 (original description)
Gonapodasmius haemuli (MacCallum & MacCallum, 1916) Ishii, 1935 (new combination reference)
Gonapodasmius okushimai Ishii, 1935 accepted as Paragonapodasmius okushimae (Ishii, 1935) Pozdnyakov, 1994 (original description)
Koellikeria (Wedlia) globosa Ishii, 1935 accepted as Wedlia globosa Ishii, 1935 (original description)
Koellikeria (Wedlia) reniformis Ishii, 1935 accepted as Wedlia reniformis Ishii, 1935 (original description)
Lobatozoum Ishii, 1935 (original description)
Lobatozoum multisacculatum Ishii, 1935 (original description)
Maccallozoum Ishii, 1935 (original description)
Maccallozoum epinepheli (MacCallum, 1917) Ishii, 1935 (new combination reference)
Nematobothriinae Ishii, 1935 (original description)
Nematobothrium (Maclarenozoum) Ishii, 1935 accepted as Nematobothrium van Beneden, 1858 (original description)
Nematobothrium pelamydis (Taschenberg, 1879) Ishii, 1935 accepted as Unitubulotestis pelamydis (Taschenburg, 1879) Nikolaeva, 1980 (new combination reference)
Nematobothrium sabae Ishii, 1935 accepted as Nematobothrium filiforme Yamaguti, 1934 (original description)
Nematobothrium scombri (Taschenberg, 1879) Ishii, 1935 (new combination reference)