Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 115-150 μm long, 53-70 μm wide, L/W=2.0, isthmus 18-26 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. didelta ? 170 x 82 μm L/W= Miyatoko m.3 Minami-Aizu Fukushima, 2008  |
E. didelta 139 x 72 μm L/W=1.9 Ko-numa Tsukiyono Gunma, 2003 |
E. didelta 115 x 65 μm L/W=1.8 Iroha-numa Zao mountain Yamagata, 2005 |
E. didelta ? 138 x 70 μm L/W= Hachiman-numa m.2 Hachimantai Iwate, 2006 |
