Genus: Planktonic; colony of 16, 32 or 64 cells, irregular in shape, without gelatinous sheath;
colony consists of subsets of 4 cells connected by gelatinous filaments extending from the center;
each subset consists of cells of two types, 2 cells located outward, kidney- or heart-shaped, other 2 cells
located inward, cylidrical, both ends rounded; a single chloroplast plate-like in shape, slightly curved, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Dimorphococcus lunatus A. Braun: Colonies of 32-64 cells each connected with thin filament, two types of cells in shape, ellipsoid and heart-like, 10-15 μm long, 5-8 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).