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Spirotrichea: Heterotrichia: Heterotrichida
Spirostomum sp.
Ehrenberg, 1833
Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Undulating membrane absent; lacnur canal from contractile vacuole (Carey, 1992).
Spirostomum minus,
cell body μm long, μm wide,
x 200, x 400, x 640, Japan, 1998 by Y. Tsukii
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