Genus: Cells are equal in size (Illustrations of The Japanese Fresh-water Algae, 1977).
Planktonic; colony within a gelatinous sheath; cell body spherical, elliptical or pear-shaped; 4 daughter cells
attached to a filament dichotomously radiating from the center of the colony;
a single chloroplast cup-shaped, with a pyrenoid.
Species:
Cell body spherical, 3-10 μm in diam., attached to radially, dichotomously branched filaments;
a single chloroplast cup-shaped, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 2, 1984).
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