Species [ var. subspeciosum ]: Variety: Cell body 41-50 μm long, 29-36 μm wide; isthmus 11-16 μm wide.
[ var. validius ]: Cell body 68-84 μm long, 47-53-(56) μm wide; isthmus 17.5-22 μm wide (Illustrations of the Japanese Fresh-Water Algae, 1977).

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C. subspeciosum v. subspeciosum 39 x 32 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	C. subspeciosum v. subspeciosum 36 x 29 μm near Karakemi m. Omachi Nagano, 2005	C. subspeciosum v. subspeciosum 36-37 x 28-29 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. subspeciosum v. subspeciosum 35 x 28 μm Numa-no-hara m. Madarao highland Niigata, 2005
C. subspeciosum or C. formosulum ? 35 x 30 μm near Ayu river Fujioka Gunma, 2004	C. subspeciosum v. validius 89 x 63 μm Uruguay, 1999

Similar species -->>
C. binum; C. formosulum; C. subcostatum; C. furcatospermum;

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