Species [ var. abbreviatum ]: Cell body (11-15)-22 μm long, (11-14.5)-22 μm wide, L/W=1.0, isthmus (4.2-5.6)-7 μm wide; semicells broad hexagon in shape.
[ f. minor ]: 8-8.4 μ;m long, 8.5-9 μm wide.
[ var. planctonicum ]: (14)-19-29 μm long, (14)-22-30 μm wide; each corner rounded, apical margin convex.
[ f. pygmaea ]: Cell body smaller, upper side of lateral margins longer than lower side and concave, 11-14 μm long, 12-14 μm wide, isthmus 4.2-6 μm wide.
[ var. gremanicum ]: Apical and lateral margins slightly concave, 12.6 μm long, 11.2 μm wide, isthmus 3.4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

C. abbreviatum v. abbreviatum ? 19 x 18 μm single pyrenoid Kaga Ishikawa, 2000	C. abbreviatum v. abbreviatum ? 12-14 x 12-13 μm near Suga-daira m. Ueda Nagano, 2006	C. abbreviatum var. ? 13 x 10 μm Shimo-no-koike Shiga highland Nagano, 2004	C. abbreviatum v. germanicum 12.5 x 11 μm Hasu-ike Shiga highland Nagano, 2005
C. abbreviatum v. germanicum 16 x 14 μm rice field Ichinoseki Iwate, 2005	C. abbreviatum v. germanicum μm Saiko 2 Toda Saitama, 2007	C. abbreviatum f. pygmaea μm Ohyachi 2 Hachimantai Akita, 2007	C. abbreviatum f. pygmaea μm Ochiai-numa 2 Noshiro Akita, 2007
C. abbreviatum ? 14 x 11 μm rice field Ichinoseki Iwate, 2005

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