Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body elongated ellipsoidal,
(115-162)-205 μm long, (60-78)-107 μm wide,
L/W=2; semicells consisting of five lobes (one terminal, four lateral); bay opening between
terminal and anterior lateral lobe is deeper and narrower than that between anterior and posterior lateral lobes;
terminal lobe laterally extended forming fun-shaped structure; three spherical swellings at the base of semicells,
with two additional swellings anteriorly
(Illustrations of The Japanese Fresh-water Algae, 1977).
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