...They lay gelatinous egg masses on the water surface, and mature in about two weeks in summer. In lakes and marshes with severe eutrophication, Tokunagayusurika akamusi and giant midges can occur in large numbers. Tokunagayusurika akamusi is a black-brown adult with a body length of about 10 mm, and emerges in large numbers in late autumn. *Some of the terminology that refers to "giant midge" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…水面にゼラチン様の卵塊を産み,夏は約2週間で成虫となる。富栄養化の著しい湖沼ではアカムシユスリカやオオユスリカが大発生をする。 アカムシユスリカTokunagayusurika akamusiは,体長10mmほどの黒褐色の成虫で,晩秋のころに集中して羽化する。… ※「オオユスリカ」について言及している用語解説の一部を掲載しています。 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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