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Heterotrichea: Heterotrichida: Spirostomatidae

 Spirostomum minus
Roux

Spirostomum minus Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).@
Species: 500-600 μm long; with slender, tapered "tail" (How to know the protozoa, 1979). 500-800 μm long; macronucleus moniliform (Kudo, 1966).

Spirostomum minus, cell body 780 μm long, 34 μm wide, peristome 214 μm long (about 1/3 body length), macronucleus moniliform, x 100, x 200, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. Tsukii
scale 200 μm scale 300 μm scale 600 μm; x 100
Spirostomum minus
scale 100 μm scale 200 μm scale 300 μm; x 200
Spirostomum minus Spirostomum minus
scale 50 μm scale 100 μm scale 150 μm; x 400
Spirostomum minus
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirostomum minus

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