Species [ var. coarctatum ]: Cell body 24-33.3 μm long, 28-40 μm wide, L/W=, isthmus 6.5-9 μm wide; corners rounded, slightly curved upward; apex slightly concave.
[ var. subcurtum Nordstedt ]: Cell body 20-28 μm long, 16-28.7 μm wide, L/W=, isthmus 5.5-12 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. coarctatum 19 x 23 μm Tane-ike Togakushi highland Nagano, 2005	S. coarctatum or S. bieneanum ? 32 x 32 μm Kashibaru marsh 5 Karatsu Saga, 2006	S. coarctatum or S. bieneanum ? μm Kashibaru m.4 Karatsu Saga, 2008	S. coarctatum or S. bieneanum ? μm Kannon-numa 10 Shimogo Fukushima, 2008

Similar species -->> S. bieneanum; S. lapponicum; S. alternans;

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