| Cell body boat-shaped | 
|   Navicula sp.1
 94 x 18 μm
 Lake Shoji
 Yamanashi, 199?
 |   N. radiosa
 2 samples
 85-91 μm
 Japan, 2005
 |   N. phyllepta ?
 3 samples
 70-92 μm
 1998-2005
 |   Navicula sp.
 60 x 12 μm
 Shiken-zaike
 Kamikawa
 Saitama, 2004
 | 
|   Navicula sp.3
 37 μm
 Nishi-Urawa
 Saitama, 2003
 |   N. cryptocephala
 44 μm
 Zenko-ji
 Nagano, 2003
 |   Navicula sp.
 64 x 18 μm
 Kuroiso
 Tochigi, 2001
 |   Navicula sp. ?
 62 x 17 μm
 Japan, 1999
 | 
|   Navicula sp.3 ?
 46, 52, 58 μm
 Japan, 1998
 |   Navicula sp.
 38 μm
 Senjo-ga-hara
 Nikko
 Tochigi, 2003
 |   Navicula sp.
 52 x 18 μm
 Japan, 199?
 |   N. bottnica ?
 49 x 16 μm
 Kawaguchi Natural p.
 Kawaguchi city
 Saitama, 2005
 | 
|   Navicula sp.3
 29 x 9 μm
 Uruguay, 1999
 |   Navicula sp. ?
 50 x 7 μm
 Japan, 1997
 |   Navicula sp. ?
 50 x 7 μm
 Japan, 1998
 |   Navicula sp.
 45 x 12 μm
 Japan, 1998
 | 
|   Navicula sp. ?
 20 x 8 μm
 Kawagoe
 Saitama, 2001
 |   Navicula sp. ?
 or Frustulia ?
 μm
 O-ike park
 Yabuki
 Fukushima, 2003
 |   Navicula sp. ?
 μm
 Chiba-Minato p.
 Chiba, 2003
 | 
|   Navicula sp.
 39 x 11 μm
 Ogasaki
 Saitama
 Saitama, 2005
 |   Navicula sp.
 36 x 11 μm
 near Oppe river
 Kawajima
 Saitama, 2005
 |   Navicula sp.
 35 x 10 μm
 Kiyose river
 Kiyose
 Tokyo, 2004
 |   Navicula sp.
 29 x 9 μm
 Kitayama park
 Higashi-Murayama
 Tokyo, 2004
 | 
| Both ends slightly constricted | 
|   N. viridula ?
 73 x μm
 Yamato
 Kanagawa, 2003
 |   Navicula sp.1 ?
 51 x 11 μm
 Japan, 1999
 |   Navicula sp.1 ?
 μm
 Matsubushi
 Saitama, 2003
 |   Navicula sp.
 μm
 Moroyama
 Saitama, 2003
 | 
|   Navicula sp.
 μm
 Sakado
 Saitama, 2003
 |   Navicula sp.
 μm
 Yamato
 Kanagawa, 2003
 | 
|   Navicula sp.4
 52 x 8.5 μm
 Uruguay, 1999
 |   Navicula sp.
 μm
 Ranzan
 Saitama, 2003
 |   Navicula sp.
 30 x 4.5 μm
 Hirose athletic p.
 Kumagaya
 Saitama, 2004
 | 
| Both ends strongly constricted | 
|   N. salinarum ?
 2 samples
 59-75 μm
 2001-2004
 |   N. constans ?
 μm
 Daidarabotchi-ike
 Iizuna-kogen
 Nagano, 2003
 |   N. clementis ?
 40 x 19 μm
 Omoi river
 Oyama
 Tochigi, 2004
 | 
|   N. pupula ?
 51 x 11 μm
 47 x 12 μm
 Akigase park
 Saitama city
 Saitama, 2005
 |   N. pupula ?
 μm
 river bank
 Doman-green Park
 Saitama, 2003
 |   N. pupula ?
 40 x 10 μm
 History and folk m.
 Tajima
 Fukushima, 2004
 |   N. pupula ?
 25 x 8.5 μm
 drainage ditch
 Saitama city
 Saitama, 2005
 | 
|   N. absoluta ?
 31 x 11 μm
 Akigase park
 Saitama
 February, 2005
 |   N. absoluta ?
 36 x 12 μm
 Akigase park
 Saitama
 September, 2005
 |   Navicula sp. ?
 47 x 13 μm
 Imou bog
 Toyohashi
 Aichi, 2004
 |   Navicula sp. ?
 40 x 10 μm
 near Town Hall
 Shobu
 Saitama, 2005
 | 
|   Navicula sp. ?
 or C. cuspidata ?
 71 x 23 μm
 Uruguay, 1999
 |   N. cuspidata ?
 10 samples
 48-82 μm
 2001-2006
 |   N. decussis ?
 2 samples
 32  μm
 2003-2004
 |   N. accomoda ?
 51 x 14 μm
 Shin-Akitsu
 Higashi-Murayama
 Tokyo, 2004
 | 
| ??? | 
|   Navicula sp. ?
 or Frustulia ?
 110 x 30 μm
 nature obs. p.
 Kitamoto
 Saitama, 2005
 |   Navicula sp.
 or Frustulia ?
 43 x 12 μm
 Shin-Akitsu
 Higashi-Murayama
 Tokyo, 2004
 |   Navicula sp.
 or Frustulia ?
 40 x 8.5 μm
 Kitayama park
 Higashi-Murayama
 Tokyo, 2004
 | 
|   Navicula sp.
 57 x 16 μm
 Shin-Akitsu
 Higashi-Murayama
 Tokyo, 2004
 |   N. harderii
 36 x 9.5 μm
 Shimo-muneoka
 Shiki
 Saitama, 2004
 |   Navicula sp. ??
 205 x 47 μm
 near City Hall
 Fujimi
 Saitama, 2004
 |