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N. sigmaformis 90,165 μm rice field Ichinoseki Iwate, 2005	N. sigmaformis 144 x 7.5 μm Kawagoe Saitama, 2001	N. sigmaformis 136 x 8.5 μm nature o. park Kitamoto Saitama, 2005	N. sigmaformis 92 x 6 μm Izumi 741 Namegawa Saitama, 2004
N. sigmaformis 147 x 7 μm Osato Saitama, 2004	N. sigmaformis 85 x 6 μm Myoyo Fukiage Saitama, 2004

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