Genus: Two chloroplasts with axis and laminae structure; axis short, laminae also short making the chloroplasts star-shaped
Species: cell body ellipsoidal, 28-60 μm long, 17-31 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body ellipsoidal in shape
C. crassa ? 39 x 24 μm Shimo-no-koike Shiga highland Nagano, 2004	C. crassa ? μm Ayamedaira 3 Katashina Gunma, 2007	C. crassa ? 50 x 20 μm 33 x 21 μm Mida-ga-hara Gassan Yamagata, 2005	C. crassa or C. brebissonii ? 55 x 25 μm Tanohara Natural p. Ontake highland Nagano, 2005
C. crassa or C. brebissonii ? 50 x 21 μm Ushidome-ike Norikura highland Nagano, 2005	C. crassa 44 x 27 μm Sukawa highland Kurikoma mt. Akita, 2007	C. crassa 34.5 x 22 μm near Meigetsuso Azuma mountains Yamagata, 2006	C. crassa ? 23 x 12 μm Numa-no-hara m. Madarao highland Niigata, 2005
C. crassa ? 15-27 x 16 μm L/W= 0.9-1.7 Kobe Hyogo, 2001

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

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