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Heterotrichea: Heterotrichida: Spirostomatidae

 Spirostomum filum
(Ehrenberg, 1838) Claparède and Lachmann, 1858
Syn. Uroleptus filum Ehrenberg, 1838

Spirostomum filum Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: 200-300 up to 700 μm long; peristome 1/4 the body length; macronucleus oval; posterior end drawn out (Kudo, 1966). 700 μm long; tail region attenuated; peristome less than 1/4 the body length; macronucleus single and ovoid (Carey, 1992).

Spirostomum filum (Ehrenberg) Claparède and Lachmann, cell body 820 μm long, 80 μm wide, posterior end drawn out, peristome less than 1/4 the body length, x 100, Japan, 199? by Y. Tsukii
scale 200 μm scale400 μm scale600 μm; x 100
Spirostomum filum
Same cell slightly contracted, 640 μm lon, 100 μm wide
scale 200 μm scale400 μm scale600 μm; x 100
Spirostomum filum

Spirostomum filum, 828 μm long, 60 μm wide, posterior end drawn out, peristome less than 1/4 the body length, x 100, by Y. Tsukii
scale 200 μm scale400 μm scale600 μm; x 100
Spirostomum filum

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