Species: Cell body 24-40.5 μm long, 21-36.5 μm wide, isthmus 8.4-16
μm; semicells slightly twisted with each other; apical view triangular with each margin slightly convexed;
side view elliptical diamond-shaped; cell wall covered with granules regularly arranged around each arm
(Illustrations of The Japanese Fresh-water Algae, 1977).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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