Water flea - Water flea

Japanese: タマミジンコ - たまみじんこ

A small water flea with a spherically swollen carapace that completely covers the body and legs. A crustacean of the family Cladocera in the order Cladocera. The body is about 0.7-1.4 mm long and is often reddish in color. It is distributed widely around the world, and in Japan it appears in paddy fields and ditches in summer in all areas except Hokkaido. A closely related species is M. rectirostris , which is found in shallow inland waters rich in organic matter in northern Japan, and the tropical M. dubia , which is found in areas south of Kyushu. [Gamo Shigeo]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

体および脚部を完全に包んでいる背甲が球状に膨れている小型のミジンコ。枝角目ミジンコ科の甲殻類。体は長さ0.7～1.4mmくらい，紅色を帯びていることが多い。世界に広く分布しており，日本では北海道を除く各地の水田，溝などに夏季に出現する。近縁種にホソタマミジンコM.rectirostrisが北日本の有機質に富む浅い陸水から，熱帯系のスカシタマミジンコM.dubiaが九州以南から知られている。【蒲生重男】

出典　株式会社平凡社世界大百科事典第２版について　情報

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