Species: Cell body large, 84-105 μm long, 63-74 μm wide,
L/W=1.3, isthmus 25-30 μm wide; semicells pyramidal in shape with flattened apex;
cellwall covered with large conical projections except the flattened apex;
many circular pores present at the center of the semicells (sizes gradually declined from center to margins)
(Illustrations of The Japanese Fresh-water Algae, 1977).
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31 μm
63 μm
94 μm; x 640
