Subgenus: Atomum (Apical area slightly depressed)
Section: Simplicia (Cell body small; cell surface smooth)
Species: Cell body small, 15-30 μm long, 12.5-21 μm wide, constriction 3-8 μm wide, L/W=1.3; semicells pyramidal in shape, basal lobes rounded, anterior margin broad, slightly depressed at the center, both corners slightly pointed; lateral view of the semicells ovoidal, apical view ellipsoidal, both sides convex (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. validum 34 x μm Omine-numa Tsukiyono Gunma, 2003 |
E. validum ? 25 x 15 μm Omine-numa Tsukiyono Gunma, 2003 |
E. validum 35 x 23 μm Omine-numa Minakami Gunma, 2006  |
E. validum 37 x 23 μm Omine-numa Minakami Gunma, 2007 |
E. validum 30 x 24 μm Ohnuma Nasu-shiobara Tochigi, 2007 |
