Genus: Colonies of 4, 8, 16 or 32 cells in a gelatinous sheath; cell body long cylindroid, strongly curved or twisted, both ends rounded; a chloroplast full within the cell; a single pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Similar to K. lunaris but more spherical, 5-6 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977). Colonies within a hyaline, gelatinous matrix; cell body flattened, broadly crescent-shaped (nearly U-shaped), both ends rounded, 6-16 μm long, 3-8 μm wide (Photomicrographs of the Freshwater Algae, 1984).

Curvature strong
K. obesa x 7 μm terminal pointed Kaga Ishikawa, 2000	K. obesa x 7 μm terminal pointed Japan, 199?	K. obesa x 6 μm terminal tapered USA, 1999	K. obesa x 7 μm Nasu Tochigi, 2001
K. obesa x μm terminal tapered Sayama Saitama, 2001	K. obesa x μm terminal pointed Sayama Saitama, 2001	K. obesa x μm stock Ssa-6 Sayama Saitama, 2001	K. obesa x μm stock Ssa-6 Ushiroya Park Saitama, 2002
K. obesa 20 x 6 μm near Yamaguchi Univ. Yamaguchi, 2004	K. obesa or K. lunaris ? terminal rounded Umi-no-nakamichi Fukuoka, 2001	K. obesa x μm Chiba-Minato Park Chiba, 2003	K. obesa x μm Omine-numa Tsukiyono Gunma, 2003
K. obesa x μm Omine-numa Tsukiyono Gunma, 2003	K. obesa x μm Omine-numa Minakami Gunma, 2006	K. obesa x μm near Omine mt. Minakami Gunma, 2007	K. obesa 23 x 6 μm near Town Hall Shobu Saitama, 2004
K. obesa 30 x 7 μm Kannon-numa Shimogo Fukushima, 2006	K. obesa x μm Saiko 2 Toda Saitama, 2007
Curvature weak
K. obesa x 7 μm terminal rounded Mizumoto Park Tokyo, 2001	K. obesa x 6 μm terminal tapered Umi-no-nakamichi Fukuoka, 2001	K. obesa x 5 μm Ueno Tokyo, 2001	K. obesa x 7 μm Kenmin-kenko f.m.p. Koshigaya Saitama, 2006

Similar Genus -->> Selenastrum; Selenodictyum; Dimorphococcus;

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