Species [var. setaceum]: Cell body quickly attenuated toward both ends (cf. C. ralfsii), each extended part longer than spindle-shaped part at middle (cf. C. kuetzingii), 150-(252-528)-600 μm long, 6-(8.6-17) μm wide, L/W=30-33; cell wall transparent or slightly yellowish, finely striated (Illustrations of The Japanese Fresh-water Algae, 1977).
T=terminal; Tv=terminal vacuole

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C. setaceum 610 x 16 μm L/W=38.1 Ochiai-numa 2 Noshiro Akita, 2007	C. setaceum μm L/W= Ko-numa 2 Minakami Gunma, 2008	C. setaceum μm L/W= Kareki-numa Nikko Tochigi, 2008
C. setaceum 410 x 10 μm L/W=41 Karakemi marsh Omachi Nagano, 2006	C. setaceum 366 x 10 μm 340 x 9 μm L/W=37 Azami-ike Norikura highland Nagano, 2006	C. setaceum μm L/W= Azami-ike Norikura highland Nagano, 2007.11	C. setaceum 344 x 9 μm L/W=38.2 Mi-ike Norikura highland Nagano, 2007
C. setaceum μm L/W= Kannon-numa Shimogo Fukushima, 2008	C. setaceum 338 x 10.5 μm L/W=32 Koigakubo marsh Tessei-cho Okayama, 2004	C. setaceum var. setaceum 295 μm L/W=37 Hiroshima, 1998 Movies
C. setaceum 346 x 9.5 μm L/W=36.4 Kashibaru marsh 5 Karatsu Saga, 2006	C. setaceum 404 x 10 μm L/W=40.4 Kashibaru marsh 2 Karatsu Saga, 2006	C. setaceum μm L/W= Kashibaru m.II Karatsu Saga, 2008	C. setaceum μm L/W= Kashibaru m.2-5 Karatsu Saga, 2008
C. setaceum 450 x 19 μm L/W=24 USA, 1999	C. setaceum 383 x 16 μm L/W=24 Uruguay, 1999	C. setaceum var. ?? μm L/W= Lake Biwa Maihara Shiga, 2003	C. setaceum ?? 330 x 6 μm L/W= O-ike w. p. Kasukabe Saitama, 2004

Similar species -->> C. kuetzingii;

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