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).
Google Image Search
Similar Species -->> P. pleuronectes;
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, 2003P. 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