長野県産アブラハヤに見いだされたAllocreadium属二生吸虫の2新種

概要

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Two new species, Allocreadium shinanoense sp. nov. and Allocreadium aburahaya sp. nov. (Digenea, Allocreadiidae), are described on the basis of adults found in the intestine of a freshwater fish, Phoxinus lagowskii steindachneri Sauvage (Osteichthyes, Cyprinidae), caught in the Hiroi River at Kotobuki, liyama, Nagano Prefecture, central Japan. Allocreadium shinanoense is most closely similar to A. tosai Shimazu, 1988, but it is different from the latter in having a larger body, a longer eversible ejaculatory duct, a more anterior extent of the vitelline follicles, and a shorter excretory vesicle. Allocreadium aburahaya is closely similar to A. tribolodontis Shimazu & Hashimoto, 1999, but it is different from the latter in having a larger sucker width ratio, irregularly indented testes, an ovate cirrus pouch, and larger eggs.
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