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:

P. lismorensis bending 54 x 38 μm tail 26 μm Higashi-Urawa Saitama, 2001

P. lismorensis bending μm Mizuko Fujimi Saitama, 2003

P. lismorensis bending μm Kejo-numa Furukawa Miyagi, 2003

P. lismorensis bending 50 x 30 μm tail 45 μm near Town Hall Shobu Saitama, 2004

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