|   C. aculeata
 40-47 μm
 Kumakubo
 Nasu-shiobara
 Tochigi, 2005
 |   C. aculeata
 40 μm
 Asa-kawa
 Hachioji
 Tokyo, 2005
 |   C. aculeata
 39 μm
 spines long
 Japan, 1998
 |   C. aculeata
 38 μm
 spines 4-8 μm
 Heisei-no-mori p.
 Kawajima
 Saitama, 2006
 
  | 
|   C. aculeata
 34 μm
 spines  μm
 Oura central p.
 Oura
 Gunma, 2006
 
  |   C. aculeata
 27, 38 μm
 spines 9 μm
 Watarase Wetland
 Fujioka
 Tochigi, 2005
 |   C. aculeata
 33 μm
 Tochigi, 2001
 |   C. aculeata
 μm
 spines  μm
 Shibasaki
 Nagareyama
 Chiba, 2008
 
  | 
|   C. aculeata
 μm
 Akigase Park
 Saitama, 2002
 |   C. aculeata
 μm
 Karasu river
 Takasaki
 Gunma, 2004
 |   C. aculeata
 μm
 Watarase river
 Ashikaga
 Tochigi, 2004
 |   C. aculeata
 μm
 Kannon-numa 9
 Shimogo
 Fukushima, 2008
 
  | 
|   C. aculeata ?
 31-56 μm
 spines short
 Japan, 1998
 | 
|   C. aculeata ?
 29 μm
 Ajisai Park
 Kodaira
 Tokyo, 2006
 
  |   C. aculeata ?
 29 μm
 spines short
 Japan, 1998
 |   C. aculeata ?
 28-32 μm
 near Okubo ike
 Shinano
 Nagano, 2004
 |   C. aculeata
 27 μm
 Tokachi river
 Obihiro
 Hokkaido, 2005
 | 
|   C. aculeata ?
 μm
 spines short
 Sayama Natural p.
 Saitama, 2001
 |   C. aculeata ?
 μm
 spines short
 Hanyu
 Saitama, 2003
 |   C. aculeata ?
 23 μm
 spines short
 Japan, 1998
 |   C. aculeata ?
 30, 40 μm
 Higashi-sano
 Hakuba
 Nagano, 2004
 | 
|   C. aculeata ?
 35 μm
 water treatment c.
 Sakado
 Saitama, 2004
 |   C. aculeata ?
 38 μm
 Takao Sakura park
 Kitamoto
 Saitama, 2005
 |   C. aculeata ?
 32 μm
 Jizoh-bori
 Sannoh Park
 Saitama, 2005
 |   C. aculeata
 20 μm
 Omine-numa
 Minakami
 Gunma, 2008
 
  | 
|   Choanocystis sp.
 17 μm
 spines short
 Japan, 1998
 |   Choanocystis sp.
 25 μm
 Omoi river
 Oyama
 Tochigi, 2004
 |   Choanocystis sp.
 μm
 spines short
 Japan, 2004
 |   Choanocystis sp.
 19 μm
 spines short
 Japan, 1998
 | 
|   Choanocystis sp.
 μm
 Daidarabotchi-ike
 Iizuna-kogen
 Nagano, 2003
 |   Choanocystis sp.
 μm
 Namegawa
 Saitama, 2003
 |   Choanocystis sp.
 30 μm
 Lake Shirakaba
 Tateshina & Chino
 Nagano, 2005
 |   Choanocystis sp.
 22 μm
 Numa-no-hara m.
 Madarao highland
 Niigata, 2005
 | 
|   Choanocystis sp.
 21 μm
 Toyonodai park
 Otone
 Saitama, 2006
 
  |   Choanocystis sp.
 μm
 Oyumi-ike 2
 Chuo-ku
 Chiba, 2007
 
  |