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Species: Cell body 140-200 (340) μm long, 25-40 (42) μm wide (Süßwasserflora von Mitteleuropa 2/1, Bacillariophyceae 1, 1997).

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P. maior ? 300 x 55 μm Ichinose-enchi Norikura highland Nagano, 2005	P. maior 270 x 40 μm Senjo-ga-hara Nikko Tochigi, 2003	P. maior 280 x 40 μm Senjo-ga-hara Nikko Tochigi, 2003	P. maior or P. macilenta ? 248 x 32 μm Komado marsh Showa and Tajima Fukushima, 2004
P. maior x 400 245 x 41 μm Japan, 1998	P. maior ? 217 x 32 μm Numa-no-hara m. Madarao highland Niigata, 2005	P. maior 212 x 30 μm Obihiro-Hasshonochi Obihiro Hokkaido, 2005	P. maior 210 x 27 μm Kinu-fureai beach Utsunomiya Tochigi, 2004
P. maior 210 x 31 μm 182 x 27 μm Demaru-nakago Kawajima Saitama, 2005	P. maior 210 x 32 μm 166 x 27 μm near Karakemi m. Omachi Nagano, 2005	P. maior 210 x 31 μm Iyari marsh Omachi Nagano, 2006	P. maior 205 x 30 μm Yoshigadaira m. Shirane mountain Gunma, 2005
P. maior 198 x 32 μm near Akai wetland Aizuwakamatsu Fukushima, 2005	P. maior 186 x 30 μm Furuike marsh Togakushi highland Nagano, 2005	P. maior 177 x 27 μm Kannon-numa Shimogo Fukushima, 2005
P. maior 160 x 32 μm Shimo-muneoka Shiki Saitama, 2004	P. maior 177 x 30 μm Morito Sawara Chiba, 2004	P. maior 167 x 28 μm Sano Hakuba Nagano, 2004	P. maior x 400 158 x ? μm Japan, 1998
P. maior 148 x 28 μm Ikenokochi marsh Tsuruga Fukui, 2004	P. maior 145 x 29 μm Senjo-ga-hara Nikko Tochigi, 2003	P. maior 160 x 27 μm Mitsumata-numa Kawagoe etc. Saitama, 2005	P. maior 155 x 24 μm Tanohara marsh Shiga highland Nagano, 2004
P. maior or P. macilenta ? 132, 148 x 22 μm near City Hall Fujimi Saitama, 2004	P. maior ? or P. viridis ? 94-155 x 21 μm Japan, 1998	P. maior or P. viridis ? 120 x 21 μm 150 x 20 μm Kahan Park Kuroiso Tochigi, 2003	P. maior or P. viridis ? 151 x 16 μm Japan, 1997

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