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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 460 μm long, 54 μm wide, peristome 144 μm long (1/3 of the body length), an ellipsoidal macronucleus (slightly irregular in shape), x 400, x 640, Matsumoto, Nagano Pref., Japan, May 2001, collected by N. Kinoshita, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Spirostomum teres
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirostomum teres Spirostomum teres Spirostomum teres

Spirostomum teres, cell body 360 μm long, 40 μm wide, peristome 130 μm long (about 1/3 of the body length), an ellipsoidal (or rod-shaped ?) macronucleus, 45 μm long, 20 μm wide, x 100, x 200, x 400, x 640, Matsumoto, Nagano Pref., Japan, May 2001, collected by N. Kinoshita, photo by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100
Spirostomum teres
scale 100 μm scale 200 μm scale 300 μm; x 200
Spirostomum teres Spirostomum teres Spirostomum teres
scale 50 μm scale 100 μm scale 150 μm; x 400
Spirostomum teres Spirostomum teres Spirostomum teres
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirostomum teres

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