Genus: Spindle, cylindrical or band-form; pellicle usually marked by longitudinal or spiral striae;
some with a thin pellicle highly plastic; stigma usually anterior; chloroplasts discoid,
band-form, or fusiform; two paramylum bodies located on
either side of nucleus, rod-like to ovoid in shape or numerous and scattered throughout; contractile vacuole
near reservoir; cell division longitudinal (Kudo, 1966).
Species: Cell body spindle-shaped with short tail, slightly plastic; flagellum short;
88-95 μm long,
20-25 μm wide;
pellicle spirally striated; chloroplasts band-shaped, numerous, arranged along with the striae;
paramylon bodies rod shaped, many;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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