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.
Images of collecting locality:
Oisezuka Park, Isehara-machi, Kawagoe city, Saitama Pref., Japan, March 18, 2006 by Y. Tsukii