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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium

Subgenus: Eucosmarium

Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation.
Subgenus:Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Section Margaritiferae: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex or trapezoid
Cosmarium pseudomagnificum
C. pseudomagnificum
7 samples
76-98 x 55-68 μm
2003-2008
Cosmarium decoratum
C. decoratum
9 samples
70-84 μm
2003-2007
Cosmarium
C. subspeciosum
5 samples
var. subspeciosum
35-36 x 29-30 μm
2004-2005
Cosmarium
C. subspeciosum
1 sample
var. validius
89 x 63 μm
Uruguay, 1999
Cosmarium
Cosmarium sp.
160 x 108 μm
Uruguay, 1999
Cosmarium
Cosmarium sp.1
111 x 66 μm
L/W=1.7
USA, 1999
Movies
Cosmarium
C. tetraophthalmum
88 x 64 μm
L/W=1.4
USA, 1999
Cosmarium binum
C. binum
14 samples
47-62 μm
1998-2008
Movies
Cosmarium
C. ochthodes
3 samples
72-82 x 55-59 μm
2005-2006
Cosmarium
C. margaritiferum
39 samples
49-81 μm
1999-2008
Cosmarium
C. vexatum
21 samples
31-56 μm
1998-2006
Cosmarium
C. botrytis
var. subtumidum
25 samples
59-77 μm
1999-2008
Cosmarium
C. raciborskii
56 x 56 μm
near City Hall
Fujimi
Saitama, 2004
Cosmarium
C. turpinii
var. eximium
65 x 52 μm
near Karakemi m.
Omachi
Nagano, 2005
Cosmarium
C. turpinii
var. eximium
45 x 39 μm
Tsukamoto
Sakura-ku
Saitama, 2004
Cosmarium
C. sportella
8 samples
38-48 μm
1998-2004
Movies
Cosmarium quinarium
C. quinarium
2 samples
39-45 μm
1999-2006
Cosmarium trachypleurum
C. trachypleurum
var. cornutum
49 x 40 μm
Nagori-ga-hara
Sukawa highland
Iwate, 2007
Cosmarium formosulum
C. formosulum
33 samples
21-41 μm
1999-2008
Movies
Cosmarium furcatospermum
C. furcatospermum
v. furcatospermum
9 samples
16-26 μm
2001-2008
Cosmarium subcostatum
C. subcostatum
4 samples
17-33 x μm
2003-2006
Cosmarium
C. polonicum ?
20 x 17 μm
Univ. A.V.M.
Obihiro
Hokkaido, 2005
Cosmarium
C. polonicum ?
20.5 x 16.5 μm
Water reservoir
Iiyama
Nagano, 2008
Cosmarium
C. notabile ?
Pyramidatae ?
7 samples
21-42 μm
1997-2005
Movies
Cosmarium
C. subcrenatum
var. subcrenatum
40 x 30 μm
Ikenokochi marsh
Tsuruga
Fukui, 2004
Cosmarium subcrenatum
C. subcrenatum
var. subcrenatum ?
35 x 25 μm
Iyari marsh
Omachi
Nagano, 2006
Cosmarium subalatum
C. subalatum
μm
Omine-numa
Tsukiyono
Gunma, 2003
Cosmarium
C. orthostichum
v. subpolonica
31 x 28 μm
Uruguay, 1999
Cosmarium
C. punctulatum
10 samples
var. punctulatum
28-45 μm
2004-2006
Cosmarium
C. sikhimense ?
46 x 31 μm
Koigakubo marsh
Tessei-cho
Okayama, 2004

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Cosmarium
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