Taxonomic Redescriptions and a Review of the Status of Prosorhynchoides spp. (Digenea: Bucephalidae) Infecting Some Freshwater Fishes of India

摘要

Surveys of freshwater fishes of India were carried out during the period 2011-2017. Members of the species of the genus Prosorhynchoides Dollfus, 1929 (Digenea: Bucephalidae) infect the intestine of freshwater and marine fishes. Prosorhynchoides fusiformis (Verma, 1936) Srivastava and Chauhan, 1973, Prosorhynchoides garuai (Verma, 1936) Srivastava and Chauhan, 1973, Prosorhynchoides karvei (Bhalerao, 1937) Srivastava and Chauhan, 1973, and Prosorhynchoides thapari (Dayal, 1948) Bott and Cribb, 2005, are redescribed from the intestine of some freshwater fishes of India. In this paper we also review the taxonomic status of Indian freshwater Prosorhynchoides spp. We transfer Prosorhynchoides macronius and Prosorhynchoides bagarius (previous name Neobucephalopsis bagarius) to P. fusiformis and accordingly revise the status of other Neobucephalopsis spp. We also transfer Prosorhynchoides sinhai, Prosorhynchoides eutropiichthis, and Prosorhynchoides mauryai (previous name Neobucephalopsis garuai) to P. garuai and consider Prosorhynchoides magnum (Verma, 1936) Srivastava and Chauhan, 1973, as a valid species. We transfer Prosorhynchoides pseudeutropei, Prosorhynchoides aspinosiensis, Prosorhynchoides mehrai, Prosorhynchoides confusus, and Prosorhynchoides minimus, including previous host records, to P. magnum, as these organisms are all similar in their position of organs and are similar in size. In revision, we transfer Prosorhynchoides belonea, Prosorhynchoides lateroporus, Prosorhynchoides gaurii, Prosorhynchoides chauhani, Prosorhynchoides canciliansis, and Neobucephalopsis (Prosorhynchoides) jhansiansis to P. karvei. We consider P. thapari as a valid species and transfer Prosorhynchoides gauhatiensis to P. thapari. A Y-shaped excretory vesicle is absent in adults of Prosorhynchoides spp. reported from India. The Gomti River, India, is a new locality record for both P. fusiformis and P. garuai. Freshwater Batchwa vacha (Eutropiichthys vacha) is a new host record for P. karvei and P. thapari. A key to distinguish adults of nominal Indian freshwater Prosorhynchoides spp. is included.