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 63-84 μm long, 56-76 μm wide, isthmus 14-20 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).
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Similar species -->> M. truncata; M. ceylanica;
67 x 56 μm
near Oyomi marsh