Species: Cell body small, (20-22)-42 μm long, (10.5-11)-17 μm wide, L/W=2-2.5; slightly depressed at the center; semicells gradually attenuated toward apex, lateral margins nearly straight, apex flat with rounded corners; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. parvulum 40.5 x 18.5 μm Mida-ga-hara Gassan (mt) Yamagata, 2006	C. parvulum 40 x 17 μm Sensho-ga-hara 1 Shizukuishi Iwate, 2007	C. parvulum 28 x 12.5 μm single pyrenoid Koigakubo marsh Tessei-cho Okayama, 2004	C. parvulum orC. cucurbita ? 48 x 19 μm Tanohara marsh Shiga highland Nagano, 2004
C. parvulum orC. cucurbita ? 41.5 x 18.5 μm Tanohara marsh Shiga highland Nagano, 2007	C. parvulum orC. cucurbita ? 41 x 18 μm Hakama marsh Madarao highland Niigata, 2005

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

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