Genus: Two chloroplasts with axis and laminae structure; axis short, laminae also short making the chloroplasts star-shaped
Species: Cell body cylindrical, distinctly broader than 10 μm; chloroplasts with longitudinal, twisting ridges (Coesel & Meesters, 2007).

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Cell body cylindrical in shape, 10-14 μm in width; L/W=2
C. gracilis 32 x 14 μm L/W= Hachiman-numa 1 Hachimantai Iwate, 2007	C. gracilis 24,29 x 12 μm L/W= Kakuman-buchi Akagi mountain Gunma, 2005	C. gracilis 23 x 12 μm L/W= Kinchakuda Hidaka Saitama, 2004	C. gracilis 40 x 11 μm L/W= 3.6 Kowashimizu Suwa Nagano, 2005
C. gracilis 54,61 x 11 μm L/W= Kowashimizu Suwa Nagano, 2007	C. gracilis 35-51 x 13-14 μm L/W= 2.7 near Karakemi marsh Omachi Nagano, 2005	C. gracilis 39-50 x 15 μm L/W= 2.6-3.3 Numa-no-hara m. Madarao highland Niigata, 2005	C. gracilis 57 x 14 μm 38 x 13 μm Omine-numa Tsukiyono Gunma, 2003
C. gracilis 41 x 14 μm Iroha-numa 2 Zao mountain Yamagata, 2006	C. gracilis ? 37-80 x 12 μm Koigakubo marsh Tessei-cho Okayama, 2004	C. gracilis ? 40 x 11.5 μm Kodanuki marsh Fujinomiya Shizuoka, 2006

Similar genus -->> Zygnema; Penium; Mesotaenium;

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