Genus: Spherical or ellipsoidal colony composed of 2-50 ovoid cells arranged radially;
cell body usually covered by short bristles; two chloroplasts lateral; no stigma;
longitudinal cell division; fresh water (Kudo, 1966).
Images of collecting locality:
Kondo-numa (Kondo pond) park, Tatebayashi city, Gunma Pref., Japan, February 18, 2006 by Y. Tsukii