Heterotrichea:
Heterotrichida: Spirostomatidae
Spirostomum filum
(Ehrenberg, 1838) Claparède and Lachmann, 1858
Syn. Uroleptus filum Ehrenberg, 1838
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).
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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
200 μm
400 μm
600 μm; x 100
Same cell slightly contracted, 640 μm lon, 100 μm wide
200 μm
400 μm
600 μm; x 100
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
200 μm
400 μm
600 μm; x 100
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