Species [var. libellula]: Similar to C. navucula (not curved, spindle or boat in shape) but large; 170-(216-224)-450 μm long, 30-(42-48)-52 μm wide; L/W = 5-8; chloroplast with 8-12 ridges; 3-5 pyrenoids in each semicell.
[ var. intermedium ]: Smaller than var. libellula; 75-(123-174) μm long, 15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell.
[var. interruptum]: Smaller than var. libellula, 90-(150-271)-400 μm long, 16-(25-31)-55 μm wide; chloroplast in each semicell separated into two pieces (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. libellula: 170-450 μm long or C. closterioides 270-315 μm long
v. libellula ? or v. interruptum ? 244 x 38 μm L/W=6.4 USA, 1999	v. libellula ? or v. interruptum ? 240 x 47 μm L/W=5.1 Oze-ga-hara Gunma, 2006	v. libellula 183 x 35 μm L/W= Omotsubo marsh Niimi Okayama, 2006
var. intermedium: 75-175 μm long or C. closterioides var. intermedium 90-140 μm long
v. interruptum 105, 137 μm L/W= Kashibaru m. 6 Karatsu Saga, 2006	v. intermedium μm L/W= Omine-numa 6 Minakami Gunma, 2007	v. intermedium 120 x 24 μm L/W=5.0 Maimeno-ike Norikura highland Nagano, 2006	v. intermedium 115 x 27 μm L/W=4.3 Numappara marsh Nasu-shiobara Tochigi, 2007
v. intermedium 128 x μm L/W= Yamamuro m.8 Maibara Shiga, 2008
var. interruptum: 90-(150-271)-400 μm long or C. closterioides 270-315 μm long
v. interruptum 145 x 25 μm L/W=5.8 Numa-no-hara m. Madarao highland Niigata, 2005	v. interruptum 140 x 26 μm L/W=5.4 Tane-ike Togakushi highland Nagano, 2006	v. interruptum 105, 137 μm L/W= Kashibaru m. 2 Karatsu Saga, 2006	v. interruptum 110 x 24 μm L/W=4.6 Ichinose-enchi Norikura highland Nagano, 2005
v. interruptum 130 x 25 μm L/W=5.2 Koigakubo marsh Tessei-cho Okayama, 2004	v. interruptum 131 x 25 μm L/W=5.2 Omine-numa Minakami Gunma, 2006	v. interruptum 147 x 26 μm L/W=5.7 Omine-numa 5 Minakami Gunma, 2007	v. interruptum 137, 160 μm L/W= Miyatoko m.5 Minami-Aizu Fukushima, 2008
v. interruptum 120 x 23 μm L/W=5.2 Ichinose-enchi Norikura highland Nagano, 2005	v. interruptum 130 x 26 μm L/W=5.0 Kodanuki marsh Fujinomiya Shizuoka, 2006	v. interruptum or C. navicula ? 108 x 20 μm L/W=5 2 pyrenoids Higashi-hiroshima Hiroshima, 1998 Movies	v. interruptum or C. navicula ? 100 x 24 μm L/W=4.2 Imou bog Toyohashi Aichi, 2004
v. interruptum 97 x 18 μm L/W=5.4 Omine-numa 5 Minakami Gunma, 2007	v. interruptum x μm L/W= Ko-numa 2 Minakami Gunma, 2008	v. interruptum 123, 137 x μm L/W= Kareki-numa Nikko Tochigi, 2008	v. interruptum x μm L/W= Kashibaru m.2 Karatsu Saga, 2008

Similar species -->> C. navicula;

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