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: Colonies of 4-32 cells within a gelatinous matrix, cells crescent in shape, termini rounded, 8-12 μm long, 3-6 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cell body tapered toward the ends
K. lunaris terminal rounded cell 17 x 2.3 μm Abiko Chiba, 2000	K. lunaris terminal rounded x 3 μm Nishi-nasuno Tochigi, 2001	K. lunaris terminal rounded 15 x 5 μm Japan, 1997	K. lunaris 15 x 4 μm terminal rounded ? Kiyose Tokyo, 2001
K. lunaris 14 x 3 μm Kosugi Toyama, 2002	K. lunaris 20 x 4 μm Kawashima or Kawajima Saitama, 2002	K. lunaris x 5 μm terminal tapered Abiko Chiba, 2000	K. lunaris terminal tapered x 3 μm Japan, 2000
K. lunaris terminal tapered x 4-5 μm near Yamaguchi Univ. Yamaguchi, 2004	K. lunaris ? Selenastrum ? terminal tapered 18 x 5.5 μm Mizumoto Park Tokyo, 2001	K. lunaris ? Selenastrum ? terminal tapered 20 x 5 μm Kawagoe Saitama, 2002	K. lunaris ? μm Chiba-Minato Park Chiba, 2003
K. lunaris ? 18-28 x 3-6 μm Iruma river Kawagoe Saitama, 2004	K. lunaris ? 17 x 4 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	K. lunaris ? Selenastrum ? 30 x 7 μm Imou bog Toyohashi Aichi, 2004	K. lunaris ? Selenastrum ? 30 x 7 μm Kabuto-yama Nishi-no-miya Hyogo, 2004
K. lunaris ? 13 x 3 μm Tane-ike Togakushi highland Nagano, 2005	K. lunaris ? 18 x 5 μm Hasu-ike Shiga highland Nagano, 2005	K. lunaris 20 x 4 μm Futayo-no-ike Haguro mountain Yamagata, 2005	K. lunaris μm near Omine mt. Minakami Gunma, 2007

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

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