Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, 22-(32-43)-60 μm long, 10.5-(20-23)-32 μm wide, isthmus 9.5-(18-21.5)-30 μm wide, L/W=2; semicells ovoidal; (Illustrations of the Japanese Fresh-water Algae, 1977).

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C. curtum ? 40 x 20 μm Fukasaku Saitama, 2002	C. curtum ? with a parasitic fungus ? Fukasaku Saitama, 2002	C. curtum 40-43 x 19-21 μm near Tama river Chofu Tokyo, 2004	C. curtum 46 x 22 μm Riverside green l. Sawara Chiba, 2004
C. curtum 42 x 23 μm standing water Akigase park Saitama, 2005	C. curtum 45 x 24 μm near Kurome r. Asaka Saitama, 2006

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