Heterotrichia: Heterotrichida: Climacostomatidae

(Ehrenberg, 1933) Kahl, 1930-1935

Family: Body large, often a truncated ovoid.
Genus: Both ends blunt (Illustrated Guide, 1985). Similar to Condylostoma, but lacks undulating membrane; with ciliated peristomal field (How to know the protozoa, 1979). Ovoid and flattened in shape; somatic ciliation uniform; peristome, with a large conspicuous AZM on the left edge, spirals down to the cytostome; right edge lacks undulating membrane; a contractile vacuole posterior, connected to two longitudinal canals (Carey, 1992).
Species: 100-300 μm; macronucleus band-form (vermiform); with or without endosymbiotic Chlorella (How to know the protozoa, 1979).

Climacostomum, x 100, x 200, x 400, x 640, Uruguay Nov. 1999, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640

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