Genus: Cell body short, with a deep constriction at the center, apical view fusiform or radially symmetrical; cell apexes without spiny projections; intermediate zone or folded structure appeared during cell division; zygospores remain within their mother cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body constricted in the middle, sinus narrow-linear part but acutely open outward, 11-22 μm long, 24-39 μm wide, L/W=2, constriction 21-28 μm wide; vertical view of cells triangular, sides straight, angles rounded; apex broad, with a short connecting process at each apical angle, excavated in the middle and forming a oblong hollow cavity between the adjacent cells; semicells transversely subrectangular, lateral margins obliquely truncate; filaments twisted (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

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D. swartzii v. swartzii ? 18 x 29 μm Kejo-numa 1 Osaki Miyagi, 2006	D. swartzii v. swartzii 17 x 38 μm Numa-no-hara m. Madarao highland Niigata, 2005	D. swartzii v. swartzii 20 x 40 μm near Akai wetland Aizuwakamatsu Fukushima, 2005
D. swartzii v. swartzii x 30 μm Numappara marsh Kuroiso Tochigi, 2003	D. swartzii v. swartzii x 35 μm Numappara marsh Kuroiso Tochigi, 2007	D. swartzii v. swartzii 15 x 28 μm Fujioka Tochigi, 2001	D. swartzii μm Kareki-numa Nikko Tochigi, 2008
D. swartzii v. swartzii ? 18 x 28 μm Naruto-Togane Sanmu Chiba, 2006	D. swartzii v. swartzii 14 x 28 μm Kurihashi Saitama, 2001	D. swartzii v. swartzii 17 x 31 μm Furuyakami Kawagoe Saitama, 2004	D. swartzii v. swartzii 17 x 26 μm Tachikawa Tokyo, 2001
D. swartzii v. swartzii 17 x 32 μm Karakemi marsh Omachi Nagano, 2006	D. swartzii v. swartzii 15 x 29 μm near Oyomi marsh Hakuba Nagano, 2004	D. swartzii v. swartzii ? 20 x 30 μm Azami-ike Norikura highland Nagano, 2006
D. swartzii v. quadrangulatum 22 x 46 μm Senuki Nasu Tochigi, 2004	D. swartzii v. quadrangulatum 20 x 40-55 μm Naruto Chiba, 2003	D. swartzii v. quadrangulatum μm near Railway St. Odate Akita, 2007

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