Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. attenuatum G.S. West ]: Cell body cylindrical, 29-51 μm long, 15-24 μm wide, L/W=2-2.5; slightly constricted at the center; lateral margins slighlty convex, attenuated toward apex; cellwall dotted.
[var. latius (W. et G.S. West) Gerloff ]: Cell body cylindrical, 39-42 μm long, 21-27 μm wide, L/W less than 2.0 (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. attenuatum: Cell body 29-51 μm long, 15-24 μm wide, L/W=2-2.5
C. cucurbita var. attenuatum ? 62 x 21 μm Sensho-ga-hara 6 Shizukuishi Iwate, 2007	C. cucurbita var. attenuatum 45 x 19 μm Sukawa highland Kurikoma mt. Akita, 2007	C. cucurbita var. attenuatum μm Shibakusadaira Zao mountain Miyagi, 2007	C. cucurbita var. attenuatum 40 x 19 μm Midagahara 5 Tate-yama Toyama, 2006
C. cucurbita var. attenuatum μm Yokotashiro Katashina Gunma, 2007	C. cucurbita var. attenuatum 39 x 19 μm Miyatoko m.3 Minami-Aizu Fukushima, 2008	C. cucurbita var. attenuatum ? 59-63 x 22-29 μm Kamino-tanbo Tsugaike highland Nagano, 2006	C. cucurbita var. attenuatum μm Ushidome-ike Norikura highland Nagano, 2007
C. cucurbita var. attenuatum 46 x 19 μm Maeyama marsh Shiga highland Nagano, 2008	C. cucurbita var. attenuatum 37 x 18 μm Kodanuki marsh Fujinomiya Shizuoka, 2006
var. latius: Cell body 39-42 μm long, 21-27 μm wide, L/W less than 2
C. cucurbita var. latius 43 x 23 μm Nagori-ga-hara Sukawa highland Iwate, 2007	C. cucurbita var. latius 42 x 24 μm Tanohara marsh Shiga highland Nagano, 2004	C. cucurbita var. latius 30 x 17 μm Uruguay, 1999

Similar species -->> C. parvulum (smaller than C. cucurbita); C. cucurbitinum (apex rounded);

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