Genus: Body round to polygonal; cingulum median, deep; thecal plates 5-6 in cingulum; some with apical and antapical horn (Illustrated Guide, 1985). Epicone (or epitheca) consists of 11-14 thecal plates; hypocone (or hypotheca) of 7-8 thecal plates (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

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P. bipes var. bipes ? 50 x 45 μm Takamatsu Kagawa, 2002	P. bipes ? var. bipes ? 50 x 44 μm Nishi-Urawa Saitama, 2001	P. bipes ? var. bipes ? 63 x 62 μm Kowashimizu Suwa Nagano, 2005	P. bipes var. globosum ? 68 x 62 μm Japan, 199?
P. bipes 63 x 60 μm Okubo Ryoke Akigase park Saitama, 2005	P. bipes ? 58 x 59 μm Imou bog Toyohashi Aichi, 2004	P. bipes ? 54 x 51 μm Shimo-no-koike Shiga highland Nagano, 2004	P. bipes ? 52 x 47 μm Tanohara marsh Shiga highland Nagano, 2004
P. bipes 65 x 57 μm Lake Kizaki Omachi Nagano, 2005	P. bipes μm Omine-numa Minakami Gunma, 2008

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