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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).

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Spirostomum minus Roux, cell body 800 μm long, 24 μm wide, peristome 272 μm long (1/3 of the body length), x 100, Japan, November 1998, by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100
Spirostomum minus Spirostomum minus

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Spirostomum minus

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