Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: Unicells lacking sheath; cell body ellipsoidal, cylindrical or spindle-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).

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S. major 52 x 30 μm Ukishima marsh Tsugaike highland Nagano, 2005	S. major 51 x 31 μm L/W= J. Skunk Cabbage m. Tsugaike highland Nagano, 2005	S. major ? 37 x 25 μm Ushidome-ike Norikura highland Nagano, 2005	S. major ? 45 x 40 μm Ushidome-ike Norikura highland Nagano, 2006
S. major ? 69 x 61 μm Mida-ga-hara 8 Gassan Yamagata, 2006	S. major ? 43 x 40 μm Mida-ga-hara 9 Gassan Yamagata, 2006	S. major ? 50 x 35 μm Oze s.k.m. Ozegahara Gunma, 2006	S. major ? 21-30 x 22 μm near Nakahara Mt. Katashina Gunma, 2007
S. major ? 21-30 x 19-21 μm Ayamedaira 3 Katashina Gunma, 2007	S. aeruginosus ? 19-30 x 15 μm Tanohara Natural p. Ontake highland Nagano, 2005	S. aeruginosus ? 23-37 x 20 μm L/W=1.2-1.9 Hachiman-numa m. Hachimantai Iwate, 2005	S. aeruginosus ? 59 x 22 μm L/W=2.7 Hachiman-numa m. Hachimantai Iwate, 2007
S. aeruginosus ? 25 x 16 μm L/W= Shimizu-daira Nasu Tochigi, 2005	S. major ? 26 x 23 μm east of Tojuro Azuma mt. Yamagata, 2007	S. major ? μm Fujimitashiro Katashina Gunma, 2008

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