Genus: Small, oval, compressed, anterior end obliquely truncate; without chloroplasts;
with two equal or subequal anterior flagella; colorless; contractile vacuole anterior (Kudo, 1966).
Species:
Cell body 15-25 μm long, 10-15 μm wide (Kudo, 1966).
15-30 μm long; body nearly oval; no chloroplasts;
reservoir-pocket distinct, surrounded by ring of bright-appearing granules;
stored carbohydrates stain red with iodine; stagnant water or infusion (How to know the protozoa, 1979).
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