Genus: Colonies of 4, 8 or 16 cells; planktonic; body crescent in shape; tapered at both ends; cells attached to each other at dorsal surface; a chloroplast curved plate-like, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body gradually tapered forming sharply pointed ends, 16-38 μm long, 5-8 μm wide, distances between apices 5-25 μm (Photocmicrographs of the Freshwater Algae, vol. 2, 1984).
| Curvature strong | |||
S. bibraianum ? x 4-6 μm L/W= Mizumoto Park Tokyo, 2001 |
S. bibraianum 28 x 5.5 μm L/W=5.1 Uruguay, 1999 |
S. bibraianum 33 x 4.7 μm L/W=7.0 Japan, 1998 |
S. bibraianum ? 34 x 6 μm L/W=5.3 Koshigaya Saitama, 2001 |
S. bibraianum 28 x 4.5 μm L/W=6.2 Urawa Saitama, 2001 |
S. bibraianum ? 29 x 8 μm L/W=3.6 Kirchneriella ? Mizumoto Park Tokyo, 2001 |
S. bibraianum ? μm L/W= Kirchneriella ? Kodama town Saitama, 2003 |
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S. bibraianum stock Tna-37, axenic 25 x 6 μm 30 x 8 μm L/W=3.8-4.2 Nasu Tochigi, 2001 |
S. bibraianum stock Hsf-30, axenic 42-45 x 5-9 μm L/W=5-8.4 Fukada Park Sanda Fukuoka, 2001 |
S. bibraianum 33 x 7 μm L/W=4.7 Tane-ike Togakushi highland Nagano, 2005 |
S. bibraianum 30 x 6 μm L/W=5.0 Nanbata castle p. Fujimi Saitama, 2005 |
| Curvature weak | |||
S. bibraianum stock Sak-2 30 x 2.4-3 μm L/W= Asaka Saitama, 2000 |
S. bibraianum stock Ssa-2 32 x 3 μm L/W= Sayama Saitama, 2001 |
S. bibraianum 32-40 x 3 μm L/W= Oh-asoh Kumagaya Saitama, 2004 |
S. bibraianum μm L/W= Kijioka Castle Ruin Kodama town Saitama, 2003 |
S. bibraianum ? 24 x 3.5 μm L/W=6.6 Nishinasuno Tochigi, 2001 |
S. bibraianum ? stock Ikk-1 18 x 2.5 μm L/W=7.2 Kaga Ishikawa, 2000 |
S. bibraianum stock Sak-2 21 x 2.5 μm L/W=8.4 Asaka Saitama, 2000 |
S. bibraianum ? 23 x 3 μm L/W=7.7 Asaka Saitama, 2000 |
S. bibraianum 31 x 7.5 μm L/W=4.1 Japan, 1998 |
S. bibraianum ? 27 x 4 μm L/W=6.8 Ikenokochi marsh Tsuruga Fukui, 2004 |
S. bibraianum ? x 4 μm L/W= near Yamaguchi Univ. Yamaguchi, 2004 |
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