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 25-30 μm long, 24-26 μm wide, broad ovoid or nearly spherical at dorsal view; dorso-ventrally grooved; tail region short, not straight; two disc-shaped paramylons; a flagellum two-times longer than the body length (An illustrated guide to freshwater zooplankton in Japan, 2000).

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P. curvicauda 38 x 28 μm Shimo-muneoka Shiki Saitama, 2004	P. curvicauda 45 x 34 μm Yamaguchi Univ. Yamaguchi, 2004	P. curvicauda ? 40 x 30 μm Omine-numa Minakami Gunma, 2006
P. curvicauda ? 50 x 30 μm Itakura Gunma, 2003	P. curvicauda ? 50 x μm Naruto Chiba, 2003	P. curvicauda ? cell μm Japan, 199?
P. curvicauda ? or Hyalophacus ? or P. ocellatus ? 39 μm Uruguay, 1999	P. curvicauda ? or Hyalophacus ? or P. ocellatus ? 27 x 20 μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	P. curvicauda or Hyalophacus ? or P. ocellatus ? 35 x 24 μm Kami-no-koike Shiga highland Nagano, 2004

Similar Species -->> P. pleuronectes;

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