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 100-115 μm long,m, 70-80 μm wide (Ciugulea I. & Triemer R.E., A Color Atlas of Phtosyntetic Euglenoids, Michigan State University Press, 2010).

P. gigas 106 x 84 μm Uruguay, 1999

P. gigas 130 x 88 μm Mizumoto Park Katsushika-ku Tokyo, 2006

P. gigas μm Tonbo-no-numa Isumi Chiba, 2007

Similar species -->> P. acuminatus;

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