Species [ var. granatum ]: Cell body small in size, (22.5-39)-47 μm long, (15.4-24)-30 μm wide, isthmus (5.6-8.6)-9 μm wide, L/W=1.7, isthmus (5.6-8.6)-9 μm wide; semicells pyramidal in shape, apex slightly flattened, side view elliptical ovoid, apical view elliptial; cell wall dotted.
[ var. subgranatum ]: Upper half of lateral margins wavy; 24-30 μm long, 17-22 μm wide, isthmus 6-9 μm wide.
[ var. ocellatum ]: A small pore present at the center of semicells, 38-44 μm long, 26-28 μm wide, isthmus 6-9 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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Apex convex, semicell nearly triangular
C. granatum 41 x 39 μm Aquatic botanical g. Sawara Chiba, 2004	C. granatum 44 x 32 μm Koume-kotohira p. Kiryu Gunma, 2006	C. granatum 41 x 30 μm rice field Ichinoseki Iwate, 2005	C. granatum 40 x 29 μm Toneri Park Tokyo, 2001
C. granatum 39 x 27 μm Kayoicho-ike Fukuoka, 2001	C. granatum 38 x 28 μm Aquatic botanical l. Sawara Chiba, 2004	C. granatum 38 x 28 μm Univ. A.V.M. Obihiro Hokkaido, 2005	C. granatum μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003
C. granatum ? 35 x 27 μm Umi-no-nakamichi Fukuoka, 2001	C. granatum 37 x 24 μm Hiroshima, 1998 Movies	C. granatum 37 x 27 μm Otto-Numa Ibaraki, 2002	C. granatum 25 x 16 μm Shinobazu ike Tokyo, 2001
C. granatum ? or laeve ? 36 x 25 μm Minuma-tanbo Saitama, 2001	C. granatum μm Lake Sai 1 Minami-ku Saitama, 2007	C. granatum μm Lake Sai Toda Saitama, 2007	C. granatum 42 x 25 μm marsh pond Azuma mt. Yamagata, 2007

Similar species -- >> C. laeve; C. scopulorum;

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