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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 contracted, 300 μm long, 64 μm wide, peristome 120 μm long (about 1/4 of the body length when extended ?), a single macronucleus ellipsoidal, 42 μm long, 15 μm wide, x 200, x 400, x 640, Kasai Seaside Park, Edogawa-ku, Tokyo, Japan, December 2001 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
x 640
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirostomum teres Spirostomum teres Spirostomum teres Spirostomum teres

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