Genus: Unicellular; planktonic; cell body nearly spherical, with 3-4 corners, from which transparent conical projections emerging;
1 or several chloroplasts plate-like, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Images of collecting locality:
Kaji-ike park, Abiko city, Chiba Pref., Japan, February 17, 2008 by Y. Tsukii