Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections) Species: Cell body large, (158-162)-205 μm long, (81-84)-106 μm wide, L/W=2, isthmus (25-26)-30 μm wide; semicells rectangular in shape, each consisting of 3 lobes; lateral lobes large, elongate rectangular, slightly concaved; cell wall covered with small pores (Illustrations of The Japanese Fresh-water Algae, 1977).
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31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.4, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii
