Genus: Generally ovoid; asymmetrical; plastic or rigid; a slit-like ventral furrow;
flagella at anterior end; cytopharynx long; contractile vacuole anterior; nucleus posterior
(Kudo, 1966).
Lightly striated; trailing flagellum longer than anterior one (How to know the protozoa, 1979).
Species: 25-40 μm long,
16-22 μm wide;
rigid, oval; somewhat flattened; pellicle slightly striated (Kudo, 1966).
Rigid; faintly spirally striated; fresh water (How to know the protozoa, 1979).
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