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: Cell body broad ovoidal or nearly circular, broad longitudinal furrow present, 13-20 (-23) μm long, 12-15 μm wide; anterior broadly rounded, posterior slightly pointed; pellicle with longitudinal striae; 1-2 paramylon bodies disc-shaped (Photomicrographs of the Freshwater Algae, 1995).

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P. stokesii v. minor 15 μm Gyoda Saitama, 2001	P. stokesii v. minor 15 μm Iwajuku Gunma, 2001	P. stokesii v. minor 17 μm Akigase Park Saitama, 2002	P. stokesii ? v. minor 16 x 10 μm Tsuchiura Ibaraki, 2002
P. stokesii v. minor 16 x 10 μm Shishizuka Tsuchiura Ibaraki, 2003	P. stokesii v. minor 16 x 10 μm Shimotsuma Ibaraki, 2003	P. stokesii v. minor 17 x 9-11 μm Mizuko-kaizuka p. Fujimi Saitama, 2004	P. stokesii v. minor 19 x 9 μm Akao Sakado Saitama, 2004
P. stokesii v. minor 15 x 9 μm Shimo-muneoka Shiki Saitama, 2004	P. stokesii v. minor 16 x 9 μm near Karasu river Fujioka Gunma, 2004	P. stokesii v. minor 16 x 8 μm Shiba river Owada Park Saitama, 2005	P. stokesii v. minor 19 x 12 μm Okubo Ryoke Akigase Park Saitama, 2005
P. stokesii ? or similar sp. ? 26-27 x μm Nanbata castle p. Fujimi Saitama, 2005	P. stokesii ? or similar sp. ? 26-27 x μm Nanbata castle p. Fujimi Saitama, 2005

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