Water worm (Epiphanes senta)

Japanese: ミズワムシ(水輪虫) - ミズワムシ（英語表記）Epiphanes senta

This rotifer belongs to the family Acanthidae. It is found in ponds and marshes throughout Japan, moving by crawling on objects, but sometimes floating. Depending on the conditions, it can cause large outbreaks. The body is long and sac-like, measuring 0.4-0.5 mm in total length. There are several funnel-like constrictions surrounding the body. Five ciliated bundles are lined up on the dorsal edge of the head disk, and there are four protuberances between the head disk and the ciliated ring. The mouth opens at the bottom of the funnel, and the mouth area is densely covered with cilia. The eyespots are colorless, and the legs are thick and short, with no protrusions. [Imajima Minoru]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ミズワムシ科の輪形動物。日本各地の池沼に分布していて，他物の上をはって移動するが，ときに浮遊する。条件によっては大発生することがある。体は長い袋状で，全長0.4～0.5mm。体をとり巻いてたが状のくびれが数ヵ所ある。頭盤の背側縁に5個の繊毛束がならび，頭盤と繊毛環との間には4個の隆起がある。口は漏斗状部の底に開き，口域に繊毛が密生している。眼点は無色，肢は太くて短く，突出しない。【今島実】

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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