Species: Cell body small in size, 25.8-32.8 μm long, 25.8-33.6 μm wide,
isthmus 7-11 μm wide; semicells elliptical diamond- or spindle-shaped in side view,
upper side of lateral margins more convex than lower ones; apical view triangular with concaved margins,
each corner truncated; cell wall covered with granules arranging circularly aroung the corners
(Illustrations of The Japanese Fresh-water Algae, 1977)
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