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: cell body slender cylindrical in shape, strongly curved, 3-8 μm long, 1-2 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cell body nearly cylindrical (both side parallel)
K. contorta ? 12 x 2.3 μm Uruguay, 1999	K. contorta 10 x 1.4 μm Umi-no-nakamichi Fukuoka, 2001	K. contorta 12 x 1.6 μm Matsumoto Nagano, 2001	K. contorta 10 x 2 μm Mizumoto Park Tokyo, 2001
K. contorta 9 x 2 μm Kawagoe Saitama, 2002	K. contorta ? 12 x 3 μm Tsukuba Ibaraki, 2002	K. contorta ? μm Aquatic botanical g. Sawara Chiba, 2004

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

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