Species: Cell body 58-75 μm long, 26.5-31 μm wide, L/W=2-2.5, isthmus 20-29 μm wide; semicells broad ellipsoidal or ovoidal, apex broad circular or narrowly flattened; cell wall finely dotted; band-form chloroplasts aligned along inner cellwall (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. thwaitesii 40 x 24 μm L/W=1.7 Sensho-ga-hara 6 Shizukuishi Iwate, 2007	C. thwaitesii μm L/W= Sensho-ga-hara 12 Shizukuishi Iwate, 2007	C. thwaitesii 44 x 24 μm L/W=1.8 Gozaisho marsh Hachimantai Iwate, 2005	C. thwaitesii μm L/W= Kuroyachi m.2 Hachimantai Iwate, 2007
C. thwaitesii μm L/W= Hachiman-numa 2 Hachimantai Iwate, 2007	C. thwaitesii 48 x 23 μm L/W= Sensho-ga-hara Shizukuishi Iwate, 2007	C. thwaitesii 46 x 24 μm L/W= Yukawa-numa Nishiwaga Iwate, 2007	C. thwaitesii 41 x 25 μm L/W= Standing water Asaka Saitama, 2008
C. thwaitesii small var. ? 37 x 18 μm L/W=2.1 Sukawa highland Kurikoma mountain Akita, 2005	C. thwaitesii small var. ? 30-34 x 16-17 μm L/W=1.9-2.1 Hakama marsh Madarao highland Niigata, 2005	C. thwaitesii small var. ? 36 x 22 μm L/W=1.6 Midagahara 7 Tate-yama Niigata, 2006	C. thwaitesii small var. ? 37 x 20 μm L/W=1.9 Midagahara 5 Tate-yama Niigata, 2006
C. thwaitesii small var. ? 34 x 17.5 μm L/W=1.9 near Iroha-numa Zao mountain Yamagata, 2006	C. thwaitesii small var. ? 30 x 15 μm L/W=2.0 Mida-ga-hara Gassan Yamagata, 2005	C. thwaitesii small var. ? 44 x 21 μm L/W=2.1 Mida-ga-hara 9 Gassan (mt) Yamagata, 2006	C. thwaitesii small var. ? 35 x 22.5 μm L/W=1.6 Mida-ga-hara 4 Gassan (mt) Yamagata, 2006
C. thwaitesii small var. ? 34 x 21 μm L/W=1.6 Oze-ga-hara Katashina Gunma, 2006	C. thwaitesii small var. ? 37 x 19 μm L/W=1.9 Karakemi marsh Yasaka Nagano, Apr. 2005	C. thwaitesii small var. ? 36 x 18 μm L/W=2.0 Karakemi marsh Yasaka Nagano, Nov. 2005	C. thwaitesii small var. ? 25 x 14.5 μm L/W=1.7 J Skunk Cabbage m Tsugaike highland Nagano, 2006
C. thwaitesii small var. ? 36.5 x 17 μm L/W=2.1 Yoshigadaira m. Shirane mountain Nagano, 2005	C. thwaitesii small var. ? 29 x 16 μm L/W=1.8 Tanohara marsh Shiga highland Nagano, 2004	C. thwaitesii 39 x 24 μm L/W=1.6 Shijuhachi-ike 4 Shiga highland Nagano, 2007	C. thwaitesii small var. ? 38 x 21 μm L/W=1.8 Tanohara Natural p. Ontake highland Nagano, 2005
C. thwaitesii small var. ? 27-29 x 16-17 μm L/W=1.6-1.8 Kama-ike Azuma mountain Fukushima, 2006	C. thwaitesii 41 x 22 μm L/W=1.9 Yahei-daira m. Azuma mountain Yamagata, 2007	C. thwaitesii 40 x 23 μm L/W=1.7 East of Tojuro Azuma mountain Yamagata, 2007

Similar species -->> C. oblongum (L/W=2.0); C. globosum (L/W=1.5); C. cucurbita; C. cucurbitinum;

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