奈良県で得られたMetagonimus otsurui (Digenera: Heterophyidae)の形態と生活史

概要

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The life cycle of Metagonimus otsurui Saito & Shimizu, 1968 (Digenea, Heterophyidae) was studied in the Takami River at Kotsukawa, Higashiyoshino Village, Nara Prefecture, Japan. Metacercariae were found encysted in Rhinogobius flumineus (Mizuno) (Osteichthyes, Gobiidae). Adults were found in the small intestine of Chimarrogale himalayaica (Gray) (Mammalia, Insectivora, Soricidae). Metacercariae from naturally infected gobies were experimentally fed to golden hamsters, from the small intestine of which ovigerous adults were recovered 8 days after infection. Cercariae in daughter rediae were obtained from Semisulcospira libertina (Gould) and S. reiniana (Brot) (Gastropoda, Pleuroceridae). They were experimentally exposed to R. flumineus and fully formed metacercariae were recovered 24 and 38 days after infection. Although the prevalence and abundance of metacercariae were low in this experiment, it is considered that the cercaria is that of M. otsurui. The adults, metacercariae, daughter redia and cercaria are described. The life cycle of the species is briefly discussed.
国立科学博物館の論文
2002-03-22