A general term for marine crustaceans of the genus Evadne in the family Coccidae. They commonly appear as coastal plankton. They are about 0.5-1mm long. At first glance, they resemble freshwater daphnia, but their carapace does not encase the leaf-like limbs, but hangs down from the back of the body, and only serves as a brood chamber. Along the coast of Japan, they appear periodically from early spring to autumn, depending on the species and the seawater temperature of their habitat. At first, only females appear, and they lay summer eggs in the brood chambers through parthenogenesis. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
海産のミジンコ類中の一つ,オオメミジンコ科エボシミジンコ属Evadneの甲殻類の総称。沿岸のプランクトンとしてふつうに出現する。体長0.5~1mmくらい。一見淡水産のミジンコに似ているが,背甲は葉状の肢を包まず,体の背側に垂れ下がっており,育房としての役を果たすだけである。日本沿岸では種類と生息地の海水温度によっても異なるが,早春より秋にかけて定期的に出現する。初めのうちは雌ばかり現れて,単為生殖によって雌は育房内に夏卵を産む。
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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