Genus: Cell body elongate, cylindrical or spindle-shaped, apex dorso-ventrally compressed with a deep incision;
centrally constricted to form 2 semicells; cell wall dotted or covered with small pores; chloroplasts consisting
of axis and lateral laminae, pyrenoids arranging linearly along the axis; zygotes spherical, smooth or rectangular
with rounded corners (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 80-(160-184)-260 μm long, 20-(28-30)-50 μm wide;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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