Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species:

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P. pusillus 30 x 10 μm Watarase Wetland Fujioka Tochigi, 2005	P. pusillus ? 25 x 11 μm Takamatsu Kagawa, 2002	P. pusillus ? 25 x 11 μm Haneo Namegawa Saitama, 2004	P. pusillus ? 33 x 11 μm Ushidome-ike Norikura highland Nagano, 2005
P. pusillus ? 16 x 8 μm Green-Park Saitama, 2001

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