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Heterotrichea: Heterotrichida: Spirostomatidae

Spirostomum intermedium
Kahl, 1930-5

Spirostomum intermedium Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: 400-600 μm; macronucleus moniliform (Kudo, 1966). 600 μm long (without expansion or attenuation); peristome 1/2 body length; macronucleus moniliform; size and the length of the peristome separate this species from S. ambiguum (1-3 mm long, peristome 2/3 the body length) (Carey, 1992).

Spirostomum intermedium (close to S. ambiguum), peristome about half of the cell length, cell body 790 μm long, μm wide, x 100, x 200, Omachi natural park, Ichikawa city, Chiba Pref., Japan, September 2001 by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100
Spirostomum ambiguum Spirostomum ambiguum

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