|  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:
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