Genus:
Cell body cylindroid or spindle in shape; spiral ribbon-like chloroplasts or laminae of
the chloroplast arranged spirally around central rod
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species :
Vegetative cells spindle-shaped, 40-232 μm long,
7-30 μm diam.,
chloroplasts with many pyrenoids, 6-8 spiral ridges
(Illustrations of The Japanese Fresh-water Algae, 1977).