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Spirotrichea: Heterotrichia: Heterotrichida

Spirostomum intermedium
Ehrenberg, 1833

Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: cell body 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 ?, cell body μm long, μm wide, Japan, 1999 by Y. Tsukii

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