Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag; cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species; cell wall usually smooth, but in some species granulated or dented or ridged (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
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S. longus 16 x 5.5 μm L/W=2.9 Uruguay, 1999 |
S. longus 14 x 4.5 μm L/W=3.1 Nishi-Nasu Saitama, 2001 |
S. longus 11 x 4 μm L/W=2.8 Japan, 2000 |
S. longus 12 x 4 μm L/W=3.0 Kiyose Tokyo, 2001 |
S. longus 11 x 5 μm Koma river Sakado Saitama, 2003 |
S. longus 12-13 x 4-5 μm Iruma river Kawagoe Saitama, 2004 |
S. longus or S. minutus ? 8 x 3.5 μm L/W=2.3 Japan, 1998 |
S. longus or S. minutus ? 9 x 4.5 μm Usui river Takasaki Gunma, 2004 |
S. longus or S. minutus ? 14 x 3 μm Tanohara marsh Shiga highland Nagano, 2005 |
S. longus or S. acutiformis ? 11-12 x 4 μm Iroha-numa Zao mountain Yamagata, 2005 |
S. longus 14 x 7 μm Oura central p. Oura Gunma, 2006  |
S. longus 15 x 6 μm Ohori-ike Fukuoka Fukuoka, 2006 |
S. longus μm Chigo-ike Shiga highland Nagano, 2008 |
