Genus: Colonies of 4-32 cells; cell body long crescent or spindle in shape, tapered at both ends;
cells attached with each other at the center of the body, paralleled or radially arranged;
no gelatinous sheath; a chloroplast; no pyrenoids; planktonic
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body needle-shaped, tapered to the sharply pointed ends, slightly twisted or curved,
25-100 μm long, 1.5-6 μm wide;
a single chloroplast parietal, plate-like, usually without pyrenoids
(Photomicrographs of the Freshwater Algae, 1985).
25-30 μm long, 2-3 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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