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Heterotrichea: Heterotrichida: Spirostomatidae

 Spirostomum teres
Claparède & Lachmann, 1859

Spirostomum teres 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 320 μm long, 30 μm wide, peristome 130 μm long (2/5 of the body length), an ellipsoidal (or rod-shaped ?) macronucleus, x 200, x 400, Japan, 1998 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
Spirostomum teres
scale 50 μm scale 100 μm scale 150 μm; x 400
Spirostomum teres Spirostomum teres Spirostomum teres Spirostomum teres Spirostomum teres

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