|   Gyrosigma sp.
 μm
 Zenko-ji
 Nagano, 2003
 |   Gyrosigma sp.
 220 x 35 μm
 drainage water
 Himi
 Toyama, 2006
 
  | 
|   Gyrosigma sp.1
 or Pleurosigma ?
 193 x  μm
 Japan, 1998
 |   Gyrosigma sp.1
 or Pleurosigma ?
 133 x 15 μm
 Kaga
 Ishikawa, 2000
 |   Gyrosigma sp.1
 or Pleurosigma ?
 133 x 15 μm
 Kawaguchi Natural p.
 Kawaguchi
 Saitama, 2005
 | 
|   Gyrosigma sp.1
 or Pleurosigma ?
 82 x 11 μm
 Japan, 1999
 |   Gyrosigma sp.2
 or Pleurosigma ?
 105 x 15 μm
 Omiya
 Saitama, 2001
 |   Gyrosigma sp.2
 or Pleurosigma ?
 121 x 17 μm
 Jizoh-bori
 Sannoh Park
 Saitama, 2005
 |   Gyrosigma sp.2
 or Pleurosigma ?
 111 x 16 μm
 Akigase Park
 Saitama, 2002
 | 
|   Gyrosigma sp.2 ?
 or Pleurosigma ?
 95 x 15 μm
 Saitama, 1999
 |   Gyrosigma sp.
 or Pleurosigma ?
 μm
 Lake Biwa
 Maihara
 Shiga, 2003
 |   Gyrosigma sp.
 or Pleurosigma ?
 μm
 Zenko-ji
 Nagano, 2003
 |   Gyrosigma sp.3
 or Pleurosigma ?
 159 x 32 μm
 Ukima Park
 Tokyo, 2001
 | 
|   Gyrosigma sp.3 ?
 or Pleurosigma ?
 105 x 15 μm
 Kitayama park
 Higashi-Murayama
 Tokyo, 2004
 |   Gyrosigma sp.3
 or Pleurosigma ?
 66 x μm
 51 x μm
 Japan, 1998
 |   Gyrosigma sp.3
 or Pleurosigma ?
 64 x μm
 59 x μm
 53 x μm
 Saitama, 1999
 |   Gyrosigma sp.3
 or Pleurosigma ?
 μm
 Doman-green Park
 Nishi-Urawa
 Saitama, 2003
 | 
|   Gyrosigma sp.3
 or Pleurosigma ?
 70 x 11.5 μm
 rice field
 Ichinoseki
 Iwate, 2005
 |   Gyrosigma sp.3
 or Pleurosigma ?
 70 x 12 μm
 Kitamoto nature p.
 Kitamoto
 Saitama, 2005
 |   Gyrosigma sp.??
 or Amphipleura ?
 μm
 Japan, 1999
 |