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Spirotrichea: Heterotrichia: Heterotrichida

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, cell body μm long, μm wide, Japan, November 1998 by Y. Tsukii

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