Subgenus: With arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: Cell body 25-36 μm long, 25-36 μm wide (including spines), isthmus 8.4-9.7 μm wide; constriction medium, bay-opening large; (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. brachiatum 22-24 x 27 μm Iroha-numa Zao mountain Yamagata, 2005	S. brachiatum x 40-45 μm 23 x 30 μm Iroha-numa 1 Zao mountain Yamagata, 2006	S. brachiatum x 40-45 μm 23 x 30 μm Iroha-numa 4 Zao mountain Yamagata, 2006	S. brachiatum 42 x 42 μm Tojuro 3 Azuma mt. Yamagata, 2007
S. brachiatum μm Miyatoko m.6 Minami-Aizu Fukushima, 2008	S. brachiatum μm Kareki-numa Nikko Tochigi, 2008
S. brachiatum 35 x 35 μm 30 x 33 μm Ukishima marsh Tsugaike highland Nagano, 2005	S. brachiatum 27 x 28 μm Ukishima marsh Tsugaike highland Nagano, 2006	S. brachiatum 30-32 x 30-32 μm Kamino-tanbo Tsugaike highland Nagano, 2006	S. brachiatum 30 x 30 μm 30 x 32 μm Shimo-no-koike Shiga highland Nagano, 2004
S. brachiatum 28 x 30 μm Shimo-no-koike Shiga highland Nagano, 2007	S. brachiatum 30 x 35 μm Karakemi marsh Omachi Nagano, 2006	S. brachiatum 32 x 32 μm Ushidome-ike Norikura highland Nagano, 2005	S. brachiatum 27 x 28 μm Ushidome-ike Norikura highland Nagano, 2006
S. brachiatum μm Ushidome-ike Norikura highland Nagano, 2007	S. brachiatum x 30-35 μm Kashibaru marsh Karatsu Saga, 2006

Similar species -- >> Tetraedron limneticum;

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