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 circular in outline, with a small rectangular space at the center;
cell body nearly spherical or triangular, 3-7 μm long, 3-6 μm wide;
chloroplasts 1-4, parietal disciform, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 3, 1985).
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