A general term for invertebrates belonging to the phylum Rotifera. Most live in freshwater, but some live in moist soil, among dry moss, and in the sea, and it is said that there are more than one million individuals in 1 liter of coastal sand and mud. There are 1,500 to 2,000 known species worldwide, and about 170 species in Japan. The body length is 0.05 to 2 mm and consists of three parts: the head, body, and legs. The surface of the body is covered with a thick cuticle or a soft integument. There is a ring organ at the front end of the body, and the cilia here look like a rotating wheel, hence the name rotifer. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
輪形動物門Rotiferaに属する無脊椎動物の総称。大部分は淡水中にすむが,一部のものは湿った土,乾いたコケの間,海中などにすみ,海岸の砂泥1l中に100万以上の個体がいるといわれる。世界に1500~2000種,日本で170種ほどが知られている。体長は0.05~2mmで頭,胴,足の三つの部分からなっている。体表は厚いクチクラの甲か,軟らかい外皮で覆われている。体の前端には輪毛器があって,ここの繊毛が車の輪が回っているように見えるところから輪虫の名がある。
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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