Family: Colorless body; two flagella, one directed anteriorly and the other usually
posteriorly; stigma absent.
Genus: Oval, flattened, longitudinally striated; anterior flagellum about four times longer than shorter trailing one; fresh or salt water (How to know the protozoa, 1979). Species:
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Marsupiogaster striata (Schewiakoff): 27 μm long (How to know the protozoa, 1979).