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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 Claparède & Lachmann, flattened cell body 280 μm long, 76 μm wide, L/W=3.7, a single macronucleus ellipsoidal, 47 μm long, 22 μm wide, L/W=2.1, x 400, x 640, a pond near Dedono-yu (hot spring), prefectural road route 215, Nishiwaga-machi (town), Iwate Pref., Japan, May 4, 2007 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
Spirostomum teres Spirostomum teres Spirostomum teres

Images of collecting locality: a pond near Dedono-yu (hot spring), prefectural road route 215, Nishiwaga-machi (town), Iwate Pref., Japan, May 4, 2007 by Y. Tsukii

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