Family [ Chlamydomonadaceae ]: Unicells; cell wall present; two flagella (Illustrations of The Japanese Fresh-water Algae, 1977).
Family [ Haematococcaceae ]: Flageller apparatus of mother cell remains until the completion of cell division (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
Genus (Ehrenberg): Cells usually fusiform; both ends hyaline; two euqal-length flagella, about 1/2 as long as cell; eye spot present in most species; two or several contractile vacuoles; transverse division to form 4 zoospores; nutrition phototrophic or chemo-organotrophic (Illustrated Guide, 1985).

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C. elongatum 16 samples 29-100 μm 2 pyrenoids many C.V. 2001-2006	C. elongatum 16 samples 29-100 μm 2 pyrenoids many C.V. 2001-2006	C. elongatum 16 samples 29-100 μm 2 pyrenoids many C.V. 2001-2006	C. intermedium 58 x 9 μm 67 x 11 μm Showa-machi g.p. Kasukabe Saitama, 2006
C. hiemale ? 60 x 4.5 μm Karakemi marsh Omachi Nagano, 2006	C. hiemale ? 60 x 5.5 μm Omine-numa Minakami Gunma, 2006	C. hiemale ? 65 x 4.5 μm Omine-numa 5 Minakami Gunma, 2007	C. hiemale ? 62 x 5 μm Omine-numa 5 Minakami Gunma, 2008
C. hiemale ? 61 x 4.5 μm Kannon-numa 1 Shimogo Fukushima, 2008	C. hiemale ? μm Oyumi-ike Chiba City Chiba, 2007
C. capillatum 24-31 x 9 μm flag. μm axenic culture iden. by Nakada Movies	C. capillatum axenic culture cell division ???, 199? iden. by Nakada Movies	C. capillatum axenic culture cell division ???, 199? iden. by Nakada Movies	C. capillatum axenic culture protagol staining ???, 199? iden. by Nakada
C. fusiforme ? or C. capillatum ? 34 x 10 μm flag. μm Matsumoto Nagano, 2001	C. metamorphum ? or C. tetragamum ? 25-31 x μm Kaminokawa Tochigi, 2004	C. metamorphum ? stock Tisk-1, axenic 17-35 x μm Kaminokawa Tochigi, 2004	C. metamorphum ? or C. tetragamum ? 22 x 5 μm Kami-muneoka Shiki Saitama, 2004
Chlorogonium sp. or Chlamydomonas ? 29 x 6 μm Shimo-muneoka Shiki Saitama, 2004	C. gracile ? 13-22 x 3.5-4 μm Shishizuka Tsuchiura Ibaraki, 2003	Chlorogonium sp. or Chlamydomonas ? 10-11 x 3 μm Ogose town Saitama, 2003	Chlorogonium sp. or Chlamydomonas ? 8 x 3 μm near Town Hall Shobu Saitama, 2004

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