Didymocystis Ariola, 1902 (identification resource)
Didymocystis crassa Ishii, 1935 (redescription)
Didymocystis miliaris Yamaguti, 1938 (redescription)
Didymocystis ovata Ishii, 1935 (redescription)
Didymocystis soleiformis Ishii, 1935 accepted as Didymosulcus soleiformis (Ishii, 1935) (redescription)
Didymocystis wedli Ariola, 1902 accepted as Didymosulcus wedli (Ariola, 1902) (redescription)
Didymozoidae Monticelli, 1888 (identification resource)
Didymozoon Taschenberg, 1879 (identification resource)
Didymozoon spirale Yamaguti, 1938 accepted as Helicodidymozoon spirale (Yamaguti, 1938) Anderson & Cribb, 1994 (redescription)
Gonapodasmiinae Ishii, 1935 (identification resource)
Gonapodasmius Ishii, 1935 (identification resource)
Gonapodasmius pacificus Yamaguti, 1938 accepted as Didymodiclinus pacificus (Yamaguti, 1938) Pozdnyakov, 1993 (redescription)
Koellikeria Cobbold, 1860 (identification resource)
Koellikeriinae Ishii, 1935 (identification resource)
Lobatozoum Ishii, 1935 (identification resource)
Metanematobothrium Yamaguti, 1938 (identification resource)
Nematobothriinae Ishii, 1935 (identification resource)
Nematobothrium van Beneden, 1858 (identification resource)
Nematobothrium filiforme Yamaguti, 1934 (redescription)
Paragonapodasmius Yamaguti, 1938 (identification resource)
Wedlia Cobbold, 1860 (identification resource)