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Gamophyceae: Zygnematales: Desmidiaceae

Staurodesmus
Teiling 1948

Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus:
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From Arthrodesmus section Tetracanthum: Lateral margins lack spiny projections
Semicells elliptical in shape
Staurodesmus
S. subulatus
var. subaequalis
or A. rhomboides ?
38 x 27 μm
USA, 1999
Staurodesmus
S. subulatus
var. nordstedtii
31 x 31 μm
Uruguay, 1999
Staurodesmus
S. convergens
4 samples
31-33 x 33-38 μm
2006-2008
Semicells inverted semicircle/hexagonal Semicells inverted trapezoid
Staurodesmus incus
S. incus
17 samples
15-25 x 13-23 μm
199?-2007
Staurodesmus controversus
S. controversus ?
18 x 15 μm
Tenbo marsh
Tsugaike highland
Nagano, 2005
Semicells inverted quadrangular Semicells inverted triangular
Staurodesmus extensus
S. extensus
10 samples
15-26 x 13-27 μm
1999-2007
Staurodesmus
S. triangularis
5 samples
var. latiusculum ?
17-22 μm
2004-2007
Staurodesmus triangularis
S. triangularis
5 samples
var. acuminatum ?
17-22 μm
2004-2007
From Staurastum section Spinastrum: With spiny projections at corners, cell wall smooth
Staurastrum longispinum
S. longispinum ?
3 samples
60-78 x 60-65 μm
Ushidome-ike
Norikura highland
Nagano, 2005-7
Staurastrum
S. connatus
26 samples
18-39 x μm
1998-2008
Staurastrum
S. apiculatus
2 samples
19 x 20 μm
spines μm
1999-2006
Staurastrum dickiei
S. dickiei
3 samples
21-31 x μm
spines μm
199-2005
Staurastrum
S. cuspidatus
7 samples
18-25 x μm
2004-2007
Staurastrum
S. bifidum ?
4 samples
x 30-31 μm
1998-2008
Staurastrum
Staurastrum sp.
S. pseudobiretum ?
small var.
24 x 25 μm
Uruguay, 1999
Staurastrum
S.leptodermum ?
x 31 μm
Onnenai
Kushiro marsh
Hokkaido, 2005
Staurastrum subscolopacinum
S.subscolopacinum
19 x 16 μm
spines 5 μm
Koshigaya
Saitama, 2001
Staurastrum
S. dejectus
20 x 20 μm
spines 7 μm
4 arms
Otto-Numa
Ibaraki, 2002
Staurastrum subscolopacinum
Staurastrum sp.
S. dejectum ?
3 arms
Otto-Numa
Ibaraki, 2002
Staurastrum wandae
S. wandae
v. brevispinum
11 samples
23-30 μm
2005-2008
Staurastrum
S. contectum
v. inevolutum
36 x 34 μm
Onnenai
Kushiro marsh
Hokkaido, 2005

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Arthrodesmus
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