Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
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).

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K. contorta 7 samples x 1.4-2.3 μm 1999-2004	K. lunaris 20 samples x 2.3-6 μm 1997-2007	K. lunaris ? Selenastrum ? terminal tapered Mizumoto Park Tokyo, 2001	K. obesa 22 samples x 4-7 μm 199?-2007
K. acuminata ? x 9 μm terminal pointed Saitama, 1999	K. acuminata ? 11-13 x 6-7 μm Ikenokochi marsh Tsuruga Fukui, 2004	K. acuminata ? 9 x 4 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004

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

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