Genus: Arrangement of 4 daughter cells flat and rectangular in shape, forming composite coenobium;
without gelatinous sheaths, no hairly projections (Illustrations of the Japanese Freshwater Algae, 1977).
Species: Cell body ellipsoidal, 8-10 μm long, 4-6 μm wide
(Illustrations of the Japanese Freshwater Algae, 1977).
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