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 13-30 μm long, 3-5 μm wide (Photomicrographs of the Freshwater Algae, vol. 2, 1984).
| Curvature strong, open circle rather than U-shaped | |||
S. gracile 28 x 5 μm L/W=5.6 Mizumoto Park Tokyo, 2001 |
S. gracile 26 x 3 μm L/W=8.7 Sanda Hyogo, 2001 |
S. gracile 25-36 x 2.5-4 L/W=9-10 near Yamaguchi Univ. Yamaguchi, 2004 |
S. gracile 15 x 5 μm L/W=3 Japan, 1997 |
S. gracile μm L/W= O-ike park Yabuki Fukushima, 2003 |
S. gracile 35 x 5 μm L/W=7 Japan, 1998 |
S. gracile 33 x 5 μm L/W=6.6 Saitama, 1999 |
S. gracile μm L/W= Sa-numa p. Shimotsuma Ibaraki, 2003 |
S. gracile 42 x 5 μm L/W=8.4 Hasu-ike Shiga highland Nagano, 2005 |
S. gracile 29 x 1.5 μm L/W=19.3 Kumakubo Nasu-shiobara Tochigi, 2005 |
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| Curvature weak, nearly U-shaped | |||
S. gracile 35 x 4 μm L/W=8.8 Japan, 1998 |
S. gracile 28 x 3 μm L/W=9.3 water reservoir near Yamaguchi Univ. Japan, 2004 |
S. gracile 25 x 3.5 μm L/W=7.1 Saitama, 1999 |
S. gracile 35 x 3 μm L/W=1.2 Chiba, 2000 |
S. gracile 25 x 2.5 μm L/W=10.0 Mizumoto Park Tokyo, 2001 |
S. gracile 20-30 x3-4 μm L/W=6.7-7.5 near Ayu river Fujioka Gunma, 2004 |
S. gracile 30 x 3-5 μm L/W=6-10 Tane-ike Togakushi highland Nagano, 2005 |
S. gracile 30 x 4 μm L/W= Junichogata Himi Toyama, 2006  |
| Curvature weak, crescent in shape | |||
S. gracile 46 x 6 μm 31 x 3 μm L/W=7.7,10 Sanda Hyogo, 2001 |
S. gracile 40 x 5 μm L/W=8 Futayo-no-ike Haguro mountain Yamagata, 2005 |
S. gracile 40 x 3-4.5 μm L/W=8.9-13.3 Nasu Tochigi, 2001 |
S. gracile 35 x 5 μm L/W=7 Uruguay, 1999 |
S. gracile 25 x 2.5-3 μm L/W=8.3-10 Saitama, 2000 |
S. gracile 25 x 5 μm 20 x 2.5 μm L/W= Mizumoto Park Tokyo, 2001 |
S. gracile μm L/W= Kodama town Saitama, 2003 |
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