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Spirotrichea: Heterotrichia: Heterotrichida

Spirostomum teres
Claparède & Lachmann, 1859

Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: 300 μm long; no expansion or attenuation of the body (?); peristome 1/2 body length; simple ovoid macronucleus; (Carey, 1992). 150-400 μm long; with one, oval macronucleus (How to know the protozoa, 1979).

Spirostomum teres, cell body μm long, μm wide, x 100, x 200, x 400, Japan, 1998 by Y. Tsukii

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