Opisthorchiidae is a family of digenean trematodes. Opisthorchiidae have cosmopolitan distribution. The most medically important species in the family Opisthorchiidae are Clonorchis sinensis, Opisthorchis viverrini, and Opisthorchis felineus, that are causes of the disease clonorchiasis. Some species are parasites of economically important fish, e.g. Clarias gariepinus. Subfamilies Thirteen subfamilies are in the family Opisthorchiidae: but their number is inconsistent: Allogomtiotrematinae - Gupta, 1955; Yamaguti, 1958 - two genera Aphallinae - Yamaguti, 1958 - one genus Delphinicolinae - Yamaguti, 1933 - one genus Diasiellinae - Yamaguti, 1958 - one genus Metorchiinae - Luhe, 1909 - four genera Oesophagicolinae - Yamaguti, 1933 - one genus Opisthorchiinae - Yamaguti, 1899 - 14 genera Pachytrematinae - Railliet, 1919; Ejsmont, 1931 - one genus Plotnikoviinae - Skrjabin, 1945; Skrjabin et Petrov, 1950 - one genus Pseudamphimerinae - Skrjabin et Petrov, 1950 - three genera Pseudamphistominae - Yamaguti, 1958 - two genera Ratziinae - Dollfus, 1929; Price, 1940 - one genus Tubangorchiinae - Yamaguti, 1958 - one genus Genera The family Opisthorchiidae consists of 33 valid genera: Agrawalotrema Sahay & Sahay, 1988 Allogomtiotrema Yamaguti, 1958 Amphimerus Barker, 1911 Cladocystis Poche, 1926 Clonorchis Looss, 1907 Cyclorchis Luhe, 1908 Delphinicola Yamaguti, 1933 Diasiella Travassos, 1949 Erschoviorchis Skrjabin, 1945 Euamphimerus Yamaguti, 1941 Evranorchis Skrjabin, 1944 Gomtia Thapar, 1930 Hepatiarius Fedzullaev, 1961 Holometra Looss, 1899 Metametorchis Morozov, 1939 Metorchis Looss, 1899 Microtrema Kobayashi, 1915 Nigerina Baugh, 1958 Oesophagicola Yamaguti, 1933 Opisthorchis Blanchard, 1895 Pachytrema Looss, 1907 Parametorchis Skrjabin, 1913 Paropisthorchis Stephens, 1912 Plotnikovia Skrjabin, 1945 Pseudamphimerus Gower, 1940 Pseudamphistomum Luhe, 1908 Pseudogomtiotrema Gupta & Jain, 1991 Ratzia Poche, 1926 Satyapalia Lakshminarayana & Hafeezullah, 1974 Thaparotrema Gupta, 1955 Trionychotrema Chin & Zhang, 1981 Tubangorchis Skrjabin, 1944 Witenbergia Vaz, 1932 References Trematode families Plagiorchiida