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Heterotrichea: Heterotrichida: Spirostomatidae

 Spirostomum minus
Roux

Spirostomum minus Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).�@
Species: 500-600 μm long; with slender, tapered "tail" (How to know the protozoa, 1979). 500-800 μm long; macronucleus moniliform (Kudo, 1966).

Spirostomum minus Roux, cell body μm long, μm wide, L/W=, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 200 μm scale 300 μm scale 600 μm; x 100
Spirostomum minus Spirostomum minus Spirostomum minus Spirostomum minus Spirostomum minus Spirostomum minus

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