Genus: Colony of 16 or 32 cells, planktonic; cell body spherical; four daughter cells connected each other
by the remnants of mother cell wall; a single chloroplast cup-shaped with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
cell body spherical, 6-7 μm in diam.,
x 640, a water reservoir (pond) near Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
31 μm 63 μm 94 μm; x 640