養魚池のカイミジンコに関する研究-1-千葉県内水面水産試験場養魚池の2種〔英文〕
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概要
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At the Chiba Prefectural Freshwater Fisheries Experimental Station some species of freshwater ostracods have often multiplied tremendously in fishponds and became a source of nuisance to pond-cultured eels. Two species of the ostracods were brought in for identification. Specimens were fixed with alcohol, and dissected and embedded in Canada balsam. The species proved to be the following: one called "Naga-Kaimijinko" was identi-fied as Candonocypris assimilis and is named "Hainaga-Kaimijinko"; the other, "Maru-Kaimijinko", was allotted to Heterocypris incongruens attenuata and named "Kawari Ibo-Kaimijinko", both of which are new to Japanese fauna. The former has hitherto been found only in Oceania in spite of its vital powers; its right valve is complicated in the marginal struc-ture. The latter has been confused with H. incongruens incongruens by some authors, but the scanning electron microscope photographs of valves may clarify the distinction between them.