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).
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C. virens
with Chlorella
225 x 113 μm
USA, 1999
C. virens
without Chlorella
300 x 160 μm
Uruguay, 1999
Climacostomum sp.
without Chlorella
130 x 83 μm
110 x 95 μm
Shirakawa
Fukushima, 1999
