Subgenus: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell )
Species: Cell body (73-95)-114 μm long, (65-77)-92 μm wide, constriction (14-21)-22 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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| Bay opening narrow | |||
E. verrucosum 80 x 61 μm Vermont-Maine USA, 1999 |
E. verrucosum 82 x 66 μm Tsukuba Ibaraki, 2000 |
E. verrucosum 82 x 69 μm Nasu Tochigi, 2000 |
E. verrucosum 87 x 72 μm Nasu Tochigi, 2004 |
E. verrucosum 75 x 63 μm Saitama, 1999 |
E. verrucosum μm Naruto Chiba, 2003 |
E. verrucosum 91 x 70 μm near carnivorous p.c. Sanmu (Naruto) Chiba, 2006 |
E. verrucosum 87 x 77 μm Kawagoe Saitama, 2004 |
E. verrucosum 85-88 x 72-76 μm Konuma Sakado Saitama, 2004 |
E. verrucosum 90 x 75 μm 85 x 73 μm Aquatic botanical g. Sawara Chiba, 2004 |
E. verrucosum 87 x 73 μm Myoyo Fukiage Saitama, 2004 |
E. verrucosum 75-85 x 60-70 μm Ichinoseki R. st. Ichinoseki Iwate, 2005 |
E. verrucosum μm Bungo-Mori Kusu Oita, 2008  |
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| Bay opening wide | |||
E. verrucosum 75 x 68 μm Hasuda Saitama, 2002 |
E. verrucosum 87 x 75 μm near City Hall Fujimi Saitama, 2004 |
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| Anterior depression weak: inner circle of granules nearly the same as those of both sides | |||
E. verrucosum 83 X 70 μm Hasuda Saitama, 2002 |
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