Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: Cell body small in size, 25.8-32.8 μm long, 25.8-33.6 μm wide, isthmus 7-11 μm wide; semicells elliptical diamond- or spindle-shaped in side view, upper side of lateral margins more convex than lower ones; apical view triangular with concaved margins, each corner truncated; cell wall covered with granules arranging circularly aroung the corners (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. dispar 31 x 34 μm Hachiman-numa m. Hachimantai Iwate, 2005	S. dispar 28 x 29 μm Mida-ga-hara Gassan Yamagata, 2005	S. dispar 33 x 30 μm Mida-ga-hara Gassan Yamagata, 2006	S. dispar 32 x 28 μm Komado marsh Showa & Tajima Fukushima, 2004
S. dispar ? 37 x 37 μm Watarase Wetland Fujioka Tochigi, 2005	S. dispar 27 x 25-30 μm Naruto Chiba, 2003	S. dispar 30 x 34 μm Higusa-numa Hikari Chiba, 2006	S. dispar 30 x 34 μm Shimo-Kenashitai 5 Hakkoda mountain Aomori, 2006
S. dispar x 30 μm Tanohara marsh Shiga highland Nagano, 2004	S. dispar 30 x 31 μm Tanohara marsh Shiga highland Nagano, 2004	S. dispar x 34 μm Tanohara marsh Shiga highland Nagano, 2006	S. dispar x 32 μm Tanohara marsh Shiga highland Nagano, 2007
S. dispar ? x 33 μm Hikage marsh Shiga highland Nagano, 2005	S. dispar 35 x 35 μm Chigo-ike 4 Shiga highland Nagano, 2006	S. dispar μm Nashi-ike Kagami-ishi Fukushima, 2008	S. dispar ? x 30 μm 20 x 28 μm Ichinose-enchi Norikura highland Nagano, 2005

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