Species: Cell body 78-90 μm long, 70-72 μm wide, L/W=1.20-1.25, isthmus 22-25 μm wide; semicells subrectangular, basal angles rounded, lateral margins convex, anical angles broadly rounded, apex truncate and flat; cell wall regularly granulated, between the granules finely punctated; side view of the semicells subcircular, vertical view oblong-elliptic; zygospores spherical or slightly depressed, with yellowish smooth wall, surrounded by mucilagenous sheath, 44.8-47.6 μm in diam. (Photomicrographs of the Freshwater Algae, vol. 3, 1985).

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var. margaritatum: Cell body 66-105 μm long, 56-82 μm wide,
v. margaritatum ? 79,80 x μm rice field Ichinoseki Iwate, 2005	v. margaritatum 80 x 84 μm Niigata, 2001	v. margaritatum ? or C. quadrum ? μm Omine-numa Tsukiyono Gunma, 2003
v. margaritatum 79 x 84 μm near City Hall Fujimi Saitama, 2004	v. margaritatum 75 x 70 μm Iida-shinden Nishi-ku Saitama, 2004	v. margaritatum 66 x 63 μm Kurihashi Saitama, 2001	v. margaritatum 72 x 76 μm Tsukamoto Sakura-ku Saitama, 2004
v. margaritatum x 73 μm Koegawa Konan Saitama, 2004	v. margaritatum 62 x 64 μm 65 x 65 μm Inari Park Toyama, 2006	v. margaritatum 81 x 82 μm Imou bog Toyohashi Aichi, 2004	v. margaritatum μm Yamakado m. Nishi-Asai Shiga, 2008
var. minor: Cell body 58-59 μm long, 58-59 μm wide,
f. minor or C. quadrum ? 66 x 59 μm Myoyo Fukiage Saitama, 2004	v. margaritatum ? or C. quadrum ? 51 x 51 μm Kayoicho-ike Fukuoka, 2001	v. margaritatum ? 45 x 45 μm Umi-no-nakamichi Fukuoka, 2001

Similar species -->> C. quadrum; C. subalatum; C. logiense;

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