Species: Cell body 46-62 μm long, 36-45 μm wide, L/W= 1.25-1.33; semicells pyramidate-trapeziform, apex trucated and 4-6 crenate, lateral margins convex, 6-8 crenate, all the crenations consist of bigranules or emarginations, bicrenate granules arranged radially from the center, which locates just above the isthmus; the 6-7 vertical series of granulte ridges present at the center; side view of the semicells ovate-oblong, convexing at the center for both side; vertical view elliptic-oblong (Photomicrographs of the Freshwater Algae, vol. 3, 1985).

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C. binum 58 x 46 μm L/W=1.3 Water field Kusu Oita, 2008	C. binum 55 x 43 μm L/W=1.3 rice field Ichinoseki Iwate, 2005	C. binum 59 x 43 μm L/W=1.4 riverside park Abukuma river Fukushima, 2005
C. binum μm L/W= Omine numa Tsukiyono Gunma, 2003	C. binum 55 x 41 μm L/W=1.3 Saitama, 1999	C. binum 53 x 43 μm L/W=1.2 near City Hall Fujimi Saitama, 2004	C. binum 58 x 42 μm L/W=1.4 near Murakuni ike Iwatsuki-bunka p. Saitama, 2006
C. binum 57 x 41 μm L/W=1.4 Aquatic botanical g. Sawara Chiba, 2004	C. binum 58 x 42 μm L/W=1.4 Aquatic botanical g. Sawara Chiba, 2004	C. binum cell μm L/W= Japan, 1998	C. binum x 41 μm L/W= Lake Nakatsuna 2 Omachi Nagano, 2007
C. binum 47 x 33 μm L/W=1.4 Kabuto-yama Nishi-no-miya Hyogo, 2004	C. binum 56 x 42 μm L/W=1.3 Hiroshima, 1998	C. binum 62 x 44 μm L/W=1.4 Kayoicho-ike Fukuoka, 2001

Similar species -->> C. subspeciosum var. validius; C. quadrifarium;

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