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