長野県から得られた二生吸虫の一新種 Metagonimus hakubaensis (Heterophyidae) : 形態と生活史

概要

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A new species, Metagonimus hakubaensis sp. n. (Digenea, Heterophyidae), is described and illustrated on the basis of adults recovered from the small intestine of rats which were experimentally fed metacercariae found in ammocoetes of a lamprey, Lethenteron reissneri (Dybowski) (Agnatha, Petromyzontidae), collected in a stream in Hakuba Village, Nagano Prefecture, central Japan. This new species is closely similar to M. katsuradai Izumi, 1935 and M. otsurui Saito et Shimizu, 1968 in that the oral sucker is larger than the ventral; but it is different from them in that neither the caeca nor the vitelline follicles extend posteriorly beyond the posterior testis, and the uterus hardly enters the post-testicular region. Mother and daughter rediae and cercariae of the new species are described from a prosobranch snail, Semisulcospira dolorosa (Gould) (Gastropoda, Pleuroceridae), from the same stream.
国立科学博物館の論文