Species: Cell body 24-40.5 μm long, 21-36.5 μm wide, isthmus 8.4-16 μm; semicells slightly twisted with each other; apical view triangular with each margin slightly convexed; side view elliptical diamond-shaped; cell wall covered with granules regularly arranged around each arm (Illustrations of The Japanese Fresh-water Algae, 1977).
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| var. punctulatum: Each side slightly concave; cell body 24-40 μm long, 21-36 μm wide | |||
v. punctulatum x 30 μm Mida-ga-hara Gassan (mt) Yamagata, 2006  |
v. punctulatum 33 x 28 μm near Akai wetland Aizuwakamatsu Fukushima, 2005 |
v. punctulatum 32 x 27 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005 |
v. punctulatum μm Miyatoko m.5 Minami-Aizu Fukushima, 2008 |
v. punctulatum 34 x 34 μm Omine-numa 6 Minakami Gunma, 2007 |
v. punctulatum 40 x 43 μm riverside park Kuroiso Tochigi, 2005 |
S. punctulatum 38 x 35 μm Kuroiso Tochigi, 2001 |
v. punctulatum 37 x 35 μm Kinu-gawa g.p. Takanezawa Tochigi, 2004 |
S. punctulatum x 33 μm Kinu-fureai beach Utsunomiya Tochigi, 2004 |
S. punctulatum v. ??? x 31 μm Chiko-zan Park Sayama Saitama, 2005 |
S. punctulatum 23 x 23 μm Kurihashi Saitama, 2001 |
S. punctulatum 38 x 35 μm Japan, 1998 |
v. punctulatum 40 x 36 μm Asa-kawa Hachioji Tokyo, 2005 |
S. punctulatum v. 33 x 31 μm Lake Kawaguchi Yamanashi, 2001 |
S. punctulatum x 25 μm near Yamakado m. Nishi-Azai Shiga, 2008 |
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v. punctulatum ? 30 x 27 μm Numa-no-hara m. Madarao highland Niigata, 2005 |
v. punctulatum 29 x 27 μm Numa-no-hara m. Madarao highland Niigata, 2005 |
v. punctulatum 31-33 x 25-28 μm Numa-no-hara m. Madarao highland Niigata, 2006 |
v. punctulatum x 36 μm Nozomiko 2 Madarao highland Nagano, 2007 |
v. punctulatum 29 x 29 μm 33 x 33 μm Higashi-sano Hakuba Nagano, 2004 |
v. punctulatum ? x 35 μm Oyomi marsh Hakuba Nagano, 2006 |
v. punctulatum x 32 μm near Karakemi m. Omachi Nagano, 2005 |
v. punctulatum 34 x 33 μm near Lake Aoki Omachi Nagano, 2006 |
v. punctulatum ? x 31 μm Kowashimizu Suwa Nagano, 2005 |
v. punctulatum ? ?? x 36 μm Azami-ike Norikura highland Nagano, 2006 |
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v. punctulatum 34 x 33 μm Ikenokochi marsh Tsuruga Fukui, 2004 |
v. punctulatum ? 33 x 31 μm Hiroshima, 1998 |
v. punctulatum 35 x 31 μm Kashibaru m.3 Karatsu Saga, 2006 |
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S. punctulatum ? or S. alternans ? μm O-ike park Yabuki Fukushima, 2003 |
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| var. subproductum: Each side slightly convex in apical view; | |||
v. subproductum ? 36 x 32 μm Omoi river Oyama Tochigi, 2004 |
v. subproductum ? 37 x 34 μm Omoi river Oyama Tochigi, 2006 |
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v. subproductum 33 x 33 μm Japan, 1998 |
v. subproductum ? 28 x 28 μm Saitama, 1999 |
v. subproductum 29 x 24 μm Naruto-Togane Sanmu Chiba, 2006 |
v. subproductum ? 28 x 30 μm Kowashimizu Suwa Nagano, 2005 |
