Heterotrichea:
Heterotrichida: Spirostomatidae
Spirostomum ambiguum
Ehrenberg, 1838
Syn. Spirostomum minutus Roux, 1901
Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).
Species: 1-3 mm long (without expansion or attenuation);
peristome 2/3 body length; macronucleus moniliform;
size and the length of the peristome separate this species from S. intermedium
(600 μm long , peristome1/2 the body length)
(Carey, 1992).
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Spirostomum ambiguum,
cell body 720 μm long, 88 μm wide,
x 100, x 200, x 400, x 640, Omachi natural park, Ichikawa city, Chiba Pref., Japan, September 2001 by Y. Tsukii
200 μm
400 μm
600 μm; x 100
100 μm
200 μm
300 μm; x 200
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Spirostomum ambiguum,
cell body 820 μm long, 88 μm wide,
x 100, x 200, x 400, x 640, Omachi natural park, Ichikawa city, Chiba Pref., Japan, September 2001 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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