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: (An illustrated guide to freshwater zooplankton in Japan, 2000).
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P. inflatus
50 x 36 μm
Ukima Park
Tokyo, 2001
P. inflatus
31 x 26.5 μm
Akigase Park
Saitama, 2002
P. inflatus
50 x 35 μm
near Town Hall
Shobu
Saitama, 2004
