Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body elongated ellipsoidal, (115-162)-205 μm long, (60-78)-107 μm wide, L/W=2; semicells consisting of five lobes (one terminal, four lateral); bay opening between terminal and anterior lateral lobe is deeper and narrower than that between anterior and posterior lateral lobes; terminal lobe laterally extended forming fun-shaped structure; three spherical swellings at the base of semicells, with two additional swellings anteriorly (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. oblongum 143 x 64 μm L/W= Ko-numa Tsukiyono Gunma, 2003 |
E. oblongum 143 x 64 μm L/W= Kawaguchi Natural p. Kawaguchi Saitama, 2005 |
E. oblongum 160 x 73 μm L/W=2.1-2.3 Kowashimizu Suwa Nagano, 2007  |
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E. oblongum 130 x 63 μm L/W= 2.1 Ushidome-ike Norikura highland Nagano, 2005 |
E. oblongum 120 x 63 μm L/W= 1.9 Ushidome-ike Norikura highland Nagano, 2006 |
E. oblongum 153-158 x 73 μm L/W=2.1-2.2 near Ichinose-enchi Norikura highland Nagano, 2005 |
E. oblongum 145-160 x 70 μm L/W=2.1-2.3 near Ichinose-enchi Norikura highland Nagano, 2006 |
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E. oblongum 152 x 71 μm L/W=2.1 Dojo-ike Norikura highland Nagano, 2006 |
E. oblongum 164 x 82 μm L/W=2.0 Imou bog 2 Toyohashi Aichi, 2006 |
E. oblongum 172 x 80 μm L/W=2.0 Kareki-numa Nikko Tochigi, 2008 |
