Species [ var. dianae ]: Cell body slightly curved, tapered toward both ends, truncated with slanted edges, small pores present at outside of both termini, inner side at center slightly convex, 150-380 μm long, 15-40 μm wide, L/W = 10-12; cell wall smooth; chloroplasts with 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body 160-323 μm long, 20-28 μm wide, L/W=8.3-12; chloroplasts with about 6 laminae; semicells with 4-8 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 6, 1987).

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var. dianae : 150-380 x 15-40 μm; L/W=10-12; sighlty swelled at the center; 5-8 pyrenoids/chl.
v. dianae 23 samples 145-260 x μm L/W=10-13 2004-2007	v. dianae 23 samples 145-260 x μm L/W=10-13 2004-2007	v. dianae 23 samples 145-260 x μm L/W=10-13 2004-2007	v. dianae 23 samples 145-260 x μm L/W=10-13 2004-2007
var. dianae (?) : L/W less than 10
v. dianae 10 samples 130-190 x μm L/W=7.0-10.0 2001-2006	v. dianae 10 samples 130-190 x μm L/W=7.0-10.0 2001-2006	v. dianae 10 samples 130-190 x μm L/W=7.0-10.0 2001-2006	v. dianae 10 samples 130-190 x μm L/W=7.0-10.0 2001-2006
var. pseudodianae : More slender; 135-300 x 12-22 μm; L/W=16-23; pyrenoids/chl.
v. pseudodianae 11 samples 144-460 x μm L/W=13-16 2004-2006	v. pseudodianae 11 samples 144-460 x μm L/W=13-16 2004-2006	v. pseudodianae 11 samples 144-460 x μm L/W=13-16 2004-2006	v. pseudodianae 11 samples 144-460 x μm L/W=13-16 2004-2006
var. arcuatum : Smaller and more strongly curved; 135-300 x 12-22 μm; L/W=9-12
v. arcuatum 310 x 22 μm L/W=14.1 Kumakubo Nasu-shiobara Tochigi, 2005	v. arcuatum or C. C. ralfsii ? 281 μm L/W=12 T. tapered, Tv. large Japan, 1998	v. arcuatum ? or C. ralfsii ? 160-205 x 16-19 μm L/W=9.4-12.8 Ohori-ike Fukuoka, 2001
var. minus : Smaller than var. dianae; -150 x -15 μm;
v. minus 24 samples 100-145 x μm L/W=8-14 2003-2007	v. minus 24 samples 100-145 x μm L/W=8-14 2003-2007	v. minus 24 samples 100-145 x μm L/W=8-14 2003-2007	v. minus 24 samples 100-145 x μm L/W=8-14 2003-2007
var. ??? :
C. dianae ? band present 117 x 15 μm L/W=7.8 Omine-numa Tsukiyono Gunma, 2003

Similar species -->> C. venus ( < 85 μm ); C. calosporum; C. parvulum; C. leibleinii; C. moniliferum;

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