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).

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640