Species: Cell body small in size, 50-56 μm long, 22-23 μm wide, L/W=2-2.5, slightly constricted at the center; semicells elongate ellipsoidal in shape, cell wall smooth; chloroplast laminae ridged and radially arranged (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. oblongum ? 55 x 20 μm L/W=2.8 Mida-ga-hara Gassan mt. Yamagata, 2006	C. oblongum ? μm L/W= Yokotashiro 5 Oze-ga-hara Gunma, 2006	C. oblongum ? 54 x 18.5 μm L/W=2.5 Midagahara 5 Tate-yama Toyama, 2006	C. oblongum ? 63 x 21.5 μm L/W= Shijuhachi-ike 4 Shiga highland Nagano, 2006.10
C. oblongum 51 x 20.5 μm L/W=2.5 Watasuge marsh Tsugaike highland Nagano, 2006	C. oblongum 41 x 17 μm L/W=2.4 Kannon-numa Shimogo Fukushima, 2005	C. oblongum 46 x 21.5 μm L/W= Shijuhachi-ike 4 Shiga highland Nagano, 2006	C. oblongum 45 x 21 μm L/W=2.1 Tanohara marsh Shiga highland Nagano, 2004
C. oblongum 45 x 21 μm L/W=2.1 Tanohara marsh Shiga highland Nagano, 2006	C. oblongum μm L/W= Chigo-ike Shiga highland Nagano, 2008	C. oblongum μm L/W= Maeyama marsh Shiga highland Nagano, 2008	C. oblongum μm L/W= Kareki-numa Nikko Tochigi, 2008
C. oblongum or C. thwaitesii ? 44 x 21 μm L/W=2.1 Omine-numa Minakami Gunma, 2006	C. oblongum or C. thwaitesii ? 44 x 21 μm L/W=2.1 Omine-numa Minakami Gunma, 2007.4	C. oblongum or C. thwaitesii ? μm L/W= Omine-numa 5 Minakami Gunma, 2007.10
C. oblongum or C. thwaitesii ? 44 x 22 μm L/W=2.0 near Kurome R. Asaka Saitama, 2006	C. oblongum or C. thwaitesii ? 41 x 20.5 μm 44 x 22.5 μm Sukawa highland Kurikoma mt. Akita, 2007	C. oblongum 41 x 22 μm Karakemi m.5 Omachi Nagano, 2008
C. oblongum or C. thwaitesii ? 45.5 x 22 μm L/W= Imou bog 3 Toyohashi Aichi, 2006	C. oblongum or C. thwaitesii ? 40 x 21 μm L/W=1.9 J Skunk Cabbage m Tsugaike highland Nagano, 2006	C. oblongum or C. thwaitesii ? 43 x 23.5 μm L/W= Shijuhachi-ike 5 Shiga highland Nagano, 2006	C. oblongum or C. thwaitesii ? 40 x 20 μm L/W=2.0 Hikage marsh Shiga highland Nagano, 2005
C. oblongum or C. thwaitesii ? μm L/W= Shibu-ike Shiga highland Nagano, 2008	C. oblongum or C. thwaitesii ? μm L/W= Yokotashiro 4 Katashina Gunma, 2007

Similar species -->> C. cucurbitinum; C. thwaitesii;
Similar genus -->> Penium polymorphum;

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