Genus: cell body flat, constricted at the center; semicell ellipsoidal or subtriangular, central area of the apex slightly elevated,
cells connected with each other at their central area of apex forming filament.
Species: Filaments not twisted; cells loosely connected to be separated; cell body 8.4-11 μm long,
7-10.8 μm wide, constriction 4-6 μm wide; semicells broad hexagonal in shape,
apex slightly depressed, with two short projections to connect with adjacent cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
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