Digeneans Parasitic in Freshwater Fishes (Osteichthyes) of Japan. Ⅸ. Opecoelidae, Opecoelinae

摘要

This paper reviews three species of the subfamily Opecoelinae Ozaki, 1925 in the family Opecoelidae Ozaki, 1925 (Trematoda, Digenea, Allocreadioidea) parasitic in freshwater fishes of Japan: Coitocaecum plagiorchis Ozaki, 1926,Dimerosaccus oncorhynchi (Eguchi, 1931),and Opecoelus ukigori Shimazu, 1988. Each species is described and figured. The life cycle of C. plagiorchis is briefly mentioned. A neotype is designated for Allocreadium oncorhynchi Eguchi, 1931, or now D. oncorhynchi. The type host is Oncorhynchus masou ishikawae Jordan and McGregor in Jordan and Hubbs, 1925 (Salmonidae), which was collected in the Nagara River at Arisaka （35°44'N， 136°56'E） (type locality)， Hachiman-cho， Gujo City， Gifu Prefecture， Japan. Keys to two subfamiles (Opecoelinae and Plagioporinae Manter, 1947) and three genera (Coitocaecum Nicoll, 1915,Dimerosaccus Shimazu, 1980, and Opecoelus Ozaki, 1925) in the subfamily Opecoelinae in Japan are presented.