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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, cell body 1060 μm long, 75 μm wide, L/W=14.1, x 100, x 200, x 400, x 640, Akebono marsh (or bog), Nidanuma (Nitanuma), Tsuchiyu-onsen, Fukushima city, Fukushima Pref., Japan, October 28, 2005 by Y. Tsukii
scale 358 μm scale 716 μm scale 1074 μm; x 56
Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum
x 400
Spirostomum ambiguum Spirostomum ambiguum
x 640
Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum

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