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: Colonies of 4 cells; cell body triangular in shape, 4-10 μm wide;
a single chloroplast plate-like, with a pyrenoid
(Illustrations of the Japanese Freshwater Algae, 1977).
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