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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 μm long, μm wide, L/W=, x 640, No.5, Omine-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
scale 358 μm scale 716 μm scale 1074 μm; x 56
Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum Spirostomum ambiguum

Images of collecting locality: No.5, Omine-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii

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