Rotatoria

Japanese: Rotatoria
Rotatoria

… Among the phylum Peltierida, the class Nematoda is the most widespread, living freely in seawater, freshwater, and on land, as well as parasitizing plants and animals. It is estimated that there are 500,000 species. The class Rotatoria is made up of microscopic animals that live mostly in freshwater, with a few living in seawater, and many of them are smaller than protozoa. Even the largest ones are less than 2 mm long, and females are generally larger. …

From [Rotifera (rotifers)]

...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 sand and mud on the coast. There are 1,500 to 2,000 species known worldwide, and about 170 species known 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. ...

*Some of the terminology that mentions "Rotatoria" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 袋形動物門の中で,線虫綱がもっとも栄え,海水,淡水,陸上などで自由生活するほか,植物や動物の体内にも寄生していて,50万種は存在すると推定されている。 輪虫綱Rotatoriaは大部分が淡水に,少数が海水中にすむ顕微鏡的な大きさの動物で原生動物より小さいものも多い。最大のものでも2mmにならず,一般に雌のほうが大きい。…

【ワムシ(輪虫)】より

…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。…

※「Rotatoria」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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