Genus:
Cell body flat, large, variable in shape, longer than wide; strong constriction at center;
each semicell with several notches; cell wall with many short spines
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
cell body 77 μm long, 73 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
Micrasterias pinnatifida (Kützing) Ralfs,
cell body 63 μm long, 67 μm wide, L/W=0.9, isthmus 10 μm wide,
x 640, No.5, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 2006 by Y. Tsukii 50 μm
100 μm
150 μm; x 400
Cell body 65 μm long, μm wide, L/W=, isthmus μm wide, x 640
Cell body 65 μm long, 65 μm wide, L/W=1.0, isthmus 10 μm wide, x 640
Cell body 61 μm long, 65 μm wide, L/W=, isthmus 11 μm wide, x 640
Images of collecting locality:
No.5, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 22, 2006 by Y. Tsukii