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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium cucurbita
Brébisson
= Actinotaenium cucurbita (Brébisson) Teiling 1954

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
Cosmarium cucurbita
C. cucurbita
var. attenuatum ?
62 x 21 μm
Sensho-ga-hara 6
Shizukuishi
Iwate, 2007
Cosmarium cucurbita
C. cucurbita
var. attenuatum
45 x 19 μm
Sukawa highland
Kurikoma mt.
Akita, 2007
Cosmarium cucurbita
C. cucurbita
var. attenuatum
μm
Shibakusadaira
Zao mountain
Miyagi, 2007
Cosmarium
C. cucurbita
var. attenuatum
40 x 19 μm
Midagahara 5
Tate-yama
Toyama, 2006
Cosmarium cucurbita
C. cucurbita
var. attenuatum
μm
Yokotashiro
Katashina
Gunma, 2007
Cosmarium
C. cucurbita
var. attenuatum
39 x 19 μm
Miyatoko m.3
Minami-Aizu
Fukushima, 2008
Cosmarium
C. cucurbita
var. attenuatum ?
59-63 x 22-29 μm
Kamino-tanbo
Tsugaike highland
Nagano, 2006
Cosmarium cucurbita
C. cucurbita
var. attenuatum
μm
Ushidome-ike
Norikura highland
Nagano, 2007
Cosmarium cucurbita
C. cucurbita
var. attenuatum
46 x 19 μm
Maeyama marsh
Shiga highland
Nagano, 2008
Cosmarium cucurbita
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
Cosmarium cucurbita
C. cucurbita
var. latius
43 x 23 μm
Nagori-ga-hara
Sukawa highland
Iwate, 2007
Cosmarium cucurbita
C. cucurbita
var. latius
42 x 24 μm
Tanohara marsh
Shiga highland
Nagano, 2004
Cosmarium
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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Cosmarium cucurbita
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