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 reniform in side view, broad-ellipsoid in face view,
(6-) 10-20 μm long, (3-) 6-10 μm wide,
attached by their convex side to radially, di- or tetrachotomously branced filaments;
a single chloroplast cup-shaped, lying at the convex side of the cells, with a pyrenoid
(Photomicrographs of the Freshwater Algae, vol. 5, 1986).
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