Family:
Genus:
Species: Cell body 50-140 μm long, 7-13 μm wide (Süßwasserflora von Mitteleuropa 2/1, Bacillariophyceae 1, 1997).

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P. gibba - Valve view - 255 x 34 μm Uruguay, 1999	P. gibba 248 x 27 μm near Tama river Komae Tokyo, 2004	P. gibba 205 x 22 μm Japan, 1999
P. gibba ? f. subundulata ? 260 x μm μm Uruguay, 1999	P. gibba f. subundulata ? 245 x 25 μm Saitama, 2001	P. gibba 240 x 23 μm Ichinose-enchi Norikura highland Nagano, 2005	P. gibba f. subundulata ? 232 x 25 μm Seseragi marsh Shiga highland Nagano, 2004
P. gibba f. subundulata ? 227-230 x 25-27 μm Kusatsu Onsen b.t. Kusatsu Nagano, 2005	P. gibba f. subundulata ? 215 x 26 μm Oura central p. Oura Gunma, 2006	P. gibba f. subundulata ? 210 x 27 μm Igashira park Mooka Tochigi, 2006	P. gibba f. subundulata ? 180 x 24 μm Senjo-ga-hara Nikko Tochigi, 2003
P. gibba 101 x 15 μm Omoi river Oyama Tochigi, 2004
P. gibba ? v. linearis 170 x 19 μm Omine-numa Tsukiyono Gunma, 2003	P. gibba ? 170 x 19 μm Tane-ike Togakushi highland Nagano, 2005	P. gibba v. mesogongyla 69 x 13 μm Koigakubo marsh Tessei-cho Okayama, 2004	P. gibba ? 84 x 9 μm Uruguay, 1999
P. gibba or P. maior ? 336 x 33 μm Uruguay, 1999	P. gibba or P. maior ? 333 μm Niigata, 2001

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