Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag;
cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species;
cell wall usually smooth, but in some species granulated or dented or ridged
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: (Photomicrographs of the Freshwater Algae, vol. 15, 1995).
Images of collecting locality:
A drainage ditch near Someino Primary School, Sakura city, Chiba Pref., Japan, March 16, 2008 by Y. Tsukii