Genus:
Cell body small, length = width, strong constriction at its center;
semicells inverted triangular, ellipsoidal, rectangular, etc. in shape; straight or slightly curved
spiny projections at each corner; one pyrenoid in each semicell; cell wall smooth
(Illustrations of The Japanese Fresh-water Algae, 1977).
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
