Genus: Cells arranged three-dimentionally; cell body crescent or cylindrical in shape, slightly curved,
separated from each other, arranged longitudinally parallel
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Colonies of 4 cells; cell body cylindrical, slightly swelled at the center, both ends
bluntly truncated, 8-18 μm long, 5-9 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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