Species:
Cell body elliptical, 50-(56-60) μm long, 42-(48-56) μm wide,
isthmus 13-(15-17) μm wide, L/W=1.3; semicells pyramid-shaped with
flattened apex, basal corner broadly rounded, both sides convex with wavy margin (about 10-13 waves or
granules), apex flat (waves/granules absent); cell wall covered with uniformely arranged granules
interspersed by small pores, side view elliptical; chloroplasts with 2 pyrenoids in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
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