Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)
Species: Cell body 64.5-75.3 μm long, 56-64.5 μm wide, constriction 14-17 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. spinulosum v. spinulosum 83 x 68 μm Iwatsuki-bunka p. Saitama, 2006  |
E. spinulosum v. spinulosum 74 x 61 μm Tachikawa Tokyo, 2001 |
E. spinulosum v. ?? 67 x 58 μm Muneoka Shiki Saitama, 2004 |
E. spinulosum v. ?? 66 x 60 μm Myoyo Fukiage Saitama, 2004 |
E. spinulosum v. inermius 71 x 57 μm Imou bog Toyohashi Aichi, 2004 |
E. spinulosum v. inermius 59 x 55 μm Koshigaya Saitama, 2001 |
E. spinulosum v. inermius ? μm Naruto Chiba, 2003 |
E. spinulosum v. inermius ? 60 x 55 μm Kamishiro Hakuba Nagano, 2004 |
E. spinulosum v. inermius μm Water field Kusu Oita, 2008 |
E. spinulosum v. inermius ? 56 x 46 μm Higashi-sano Hakuba Nagano, 2004 |
E. spinulosum v. inermius 62,63 x 50 μm Univ. of A.V.M. Obihiro Hokkaido, 2005 |
