Genus: Oval, flattened; more or less rigid; flagella arise from a cytostome, one trailing; protrusible
cytopharynx a long conical tubule (siphon) almost reaching posterior end; fresh water (Kudo, 1966).
Species:
About 20 μm long
(Kudo, 1966; How to know the protozoa, 1979);
trailing flagellum more than twice the length of anterior one (How to know the protozoa, 1979);
20-25 μm long, 10-15
μm wide (Illustrated Guide, 1985);
Cell body ovoidal with 6-7 longitudinal grooves, 20-30 μm long, 12-18 μm wide;
anterior flagellum nearly the same as the cell body in length, trailing flagellum about twice of the cell body in length
(An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
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