Species:
cell body spindle-form, plastic,
(50)-78-85-(95) μm long,
14.5-19 (21) μm wide;
flagellum 1-1.5 times longer than body;
pellicle with herical lines; ; many discoid chloroplasts; no pyrenoids;
many rod-shaped paramyllum bodies
(Illustrations of The Japanese Fresh-water Algae, 1977).