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Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum iotanum
Wolle iotanum
or Staurastrum tetracerum Ralfs 1848 ?

Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells.
Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)

Species:
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v. iotanum: 3 arm-like projections
Staurastrum subparvulum
v. iotanum
μm
Omine-numa
Tsukiyono
Gunma, 2003
Staurastrum iotatum
v. iotanum
19 x 13 μm
Tane-ike
Togakushi highland
Nagano, 2005
Staurastrum iotanum
v. iotanum
25 x 30 μm
Shimo-no-koike
Shiga highland
Nagano, 2006
Staurastrum
v. iotanum
18 x 19 μm
24 x 24 μm
Kumakubo
Nasu-shiobara
Tochigi, 2005
v. tortum: 2 arm-like projections; 28 μm long (including arms)
Staurastrum
v. tortum
23 x 24 μm
Showa Memorial p.
Tokyo, 2001
Staurastrum iotanum
v. tortum
28 x 27 μm
Akigase Park
Saitama, 2002
Staurastrum
v. tortum
28 x 27 μm
Sanda
Hyogo, 2001
Staurastrum iotanum
v. tortum
28 x 28 μm
Kenmin-kenko f.m.
Koshigaya
Saitama, 2006
Staurastrum
v. tortum
19 x 20 μm
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
Staurastrum iotanum
v. tortum
22 x 24 μm
Koigakubo marsh
Tessei-cho
Okayama, 2004
Staurastrum iotanum
v. tortum
27 x 28 μm
Lake Nojiri
Shinano
Nagano, 2004
Staurastrum iotanum
v. tortum
29 x 34 μm
Hasu-ike
Shiga highland
Nagano, 2005
Staurastrum iotanum
v. tortum
μm
Maimeno-ike 3
Norikura highland
Nagano, 2007
Staurastrum
v. tortum
x 30 μm
Iroha-numa 3
Zao mountain
Yamagata, 2006
Staurastrum iotanum
v. tortum
24 x 26 μm
Kashiwa v.m.p.
Kashiwa
Chiba, 2008
v. longatum: 2 arm-like projections; 38.7 μm long (including arms)
Staurastrum iotanum
v. longatum
35 x 38 μm
near Dedono-yu
Nishiwaga
Iwate, 2007
Staurastrum
v. longatum
37 x 45 μm
Shirahata-Numa
Urawa
Saitama, 2005
Staurastrum
v. longatum ?
x 38 μm
Shinobazu-ike
Tokyo, 2001
Simiar species -->> S. biexcavatum;

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Staurastrum
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