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: 45-100 μm long, 30-70 μm wide; short posterior prolongation slightly curved; a prominent ridge on the convex side; longitudinally striated; one ? circular paramylon (paramylum) body near center; flagellum as long as cell body (Kudo, 1966). Cell body nearly spherical at dorsal view; anterior end separated into two spherical projections; cauda strongly curved; dorsal ridge short or absent (cf. dorsal ridge present P. triqueter); cell body 40-80 μm long, 30-50 μm wide; two ? paramylon bodies disc-shaped; striae straight (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Large variety
P. pleuronectes one paramylon μm Japan, 199?	P. pleuronectes ? 77 x 42 μm near Town Hall Shobu Saitama, 2004	P. pleuronectes one paramylon 75 x 46 μm near Town Hall Shobu Saitama, 2004	P. pleuronectes one paramylon 66 μm posterior wide Kasama Park Ibaraki, 2002
P. pleuronectes 88 x 53 μm Mizumoto Park Katshika-ku Tokyo, 2006	P. pleuronectes one paramylon 64 x 37 μm Tokyo, 2001	P. pleuronectes two paramylons 61 μm Mihashi Park Saitama, 2002	P. pleuronectes ? one paramylons 55 μm Near Ukima Park Tokyo, 2001
P. pleuronectes ? 55 μm posterior wide Uruguay, 1999	P. pleuronectes ? 50 x 30 μm 53 x 33 μm Kijioka Castle Ruin Kodama Saitama, 2003	P. pleuronectes ? 50 x 44 μm Japan, 1998	P. pleuronectes ? 47 μm Tsuchiura Ibaraki, 2002
Small variety (or P. curvicauda or P. acuminata ??)
P. pleuronectes 46 μm Hiroshima, 1998 Movies	P. pleuronectes 43 μm Koshigaya Saitama, 2001	P. pleuronectes ? μm Near Omine-numa Tsukiyono Gunma, 2003
P. pleuronectes or P. curvicauda ? 39 x 35 μm posterior narrow Saitama, 1999	P. pleuronectes or P. curvicauda ? 38 μm posterior wide Uruguay, 1999	P. pleuronectes or P. curvicauda ? 38 μm posterior wide Uruguay, 1999

Similar species -- >> P. triqueter; P. curvicauda;

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