Genus: Planktonic; colony of 2-8 cells surrounded by cell wall of their mother cell, but sometimes unicellular;
cell body broad ellipsoidal, both ends slightly pointed and with a thick cell wall;
1-3 chloroplasts parietal plate-like, with a single pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
cell body μm long, μm wide,
x 640, Koshigaya, Saitama Pref., Japan, July 2001 by Y. Tsukii