Order: Cell body covered with theca; cingulum (horizontal groove) and sulcus (vertical groove) consipicuous.
Family: With long horn-like processes (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Body flattened; with one anterior and 1-4 posterior horn-like processes; chloroplasts yellow, brown, or greenish; numerous species (Kudo, 1960).

->> Description at WPRNO

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C. furca or C. furcoides ? μm anterior straight Japan, 199?	C. furca or C. furcoides ? 188 μm anterior straight Saitama, 1999	C. furca or C. furcoides ? 184 μm anterior curved Nishi-Urawa Saitama, 2001	C. furca or C. furcoides ? 165 x 38 μm Sannoh park Nishi-ku Saitama, 2004
C. furca or C. furcoides ? 310 x 58 μm Komado marsh Showa and Tajima Fukushima, 2004	C. furca or C. furcoides ? 156 μm anterior curved Asaka Saitama, 1998	C. furca or C. furcoides ? 150 μm anterior curved Mizumoto Park Tokyo, 2001
C. hirundinella μm anterior straight Yamanashi, 199?	C. hirundinella μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	C. hirundinella 240 x 60 μm Momijidani h.b. Shiobara Tochigi, 2004
C. hirundinella 210 x 76 μm Lake Kizaki Omachi Nagano, 2005	C. hirundinella μm Lake Biwa Maibara Shiga, 2008

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