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Heterotrichea: Heterotrichida: Spirostomatidae

 Spirostomum ambiguum
Ehrenberg, 1838
Syn. Spirostomum minutus Roux, 1901

Spirostomum ambiguum Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: 1-3 mm long (without expansion or attenuation); peristome 2/3 body length; macronucleus moniliform; size and the length of the peristome separate this species from S. intermedium (600 μm long , peristome1/2 the body length) (Carey, 1992).

Spirostomum ambiguum Ehrenberg, cell body 1140 μm long, 196 μm wide, x 100, x 200, Diamond marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100
Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum

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