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P. gibba - Valve view - 18 samples 69-336 μm 1999-2006	P. nobilis - Valve view - 296 x 44 μm Niigata, 2001	P. nobilis ? 250 x 40 μm Izumo Shrine Izumo Shimane, 2006	P. maior = P. major 29 samples 94-280 μm 1997-2006
P. maior or P. viridis ? 152 x 25 μm Koigakubo marsh Tessei-cho Okayama, 2004	P. viridis ? 30 samples 46-155 μm 1997-2005	P. episcopalis 170 x 42 μm near Imori pond Myoko highland Niigata, 2004	Pinnularia sp. 117 x 22 μm near Town Hall Shobu Saitama, 2005
Pinnularia sp. 129 x 21 μm Numa-no-hara m. Madarao highland Niigata, 2005	Pinnularia sp. 110 x 20 μm Kamonoyachi n. Zao onsen Yamagata, 2005	Pinnularia sp. 91 x 19 μm near Town Hall Shobu Saitama, 2005	Pinnularia sp. 103 x 19 μm 93 x 25 μm Numa-no-hara m. Madarao highland Niigata, 2005
P. divergens ? 83 x 16 μm 108 x 17 μm Numa-no-hara m. Madarao highland Niigata, 2005	Pinnularia sp. 85 x 20 μm Kusatsu Onsen b.t. Kusatsu Gunma, 2005
Pinnularia sp. ? or Caloneis ? 59 x 16 μm Kawagoe Saitama, 2001	Pinnularia sp. - Valve view - μm Chichibu Saitama, 2003	Pinnularia sp.3 - Valve view - 71 x 17 μm Japan, 1999	Pinnularia sp. 104 x 19 μm Taki-no-joshi p. Tokorozawa Saitama, 2003
Constriction at both ends
P. biceps ? 8 samples μm 1998-2005	Pinnularia sp. or Caloneis ? 38 x 12 μm Kawagoe Saitama, 2001	P. platycephala ? 66 x 14 μm Uruguay, 1999
P. mesolepta ? or Caloneis? 40 x 8.5 μm Kawagoe Saitama, 2001	P. mesolepta ? or Caloneis ? μm Tsuchiura Ibaraki, 2003

Similar species -->> Caloneis;

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