Family: Synhymenium sparsely ciliated, extends from postoral region onto left preoral body surface; somewhat dorsoventrally flattened; thigmotactic (Illustrated Guide, 1985).
Genus: Both body surfaces ciliated (Illustrated Guide, 1985). Body ovoid or anterior projected toward left; flattened on both sides; both surface ciliated; cyrtos straight; a large macronucleus (Carey, 1992).

C. depressa 5 clips 80 x 40 μm Japan, 1998

Chilodontopsis sp. 4 clips near ayase river Fujimi Saitama, 1999

Chilodontopsis sp. 2 clips Iida-shinden Saitama (Urawa) Saitama, 1999

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