Genus: Only 1 emergent flagellum; locomotory flagellum directed anteriorly, straight, during swimming;
colourless, phagotrophic; no eyespot; rigid, solitary, ovoid, usually flat, with several keels; freshwater
(Illustrated Guide, 1985).
Oval or pyriform; not plastic; pellicle often with straight or spiral furrow; a single flagellum; many species
(Kudo, 1966).
Species: 30-35 μm; 2 dorsal, 2 ventral grooves on either side of dorsal and ventral keels (How to know the protozoa, 1979).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
* P. bicarinata:
30-35 μm;
2 dorsal, 2 ventral grooves on either side of dorsal and ventral keels (How to know the protozoa, 1979).
P. mediocanellata:
21-26 μm;
with median, longitudinal grooves, dorsal and ventral (How to know the protozoa, 1979).
P. alata:
23-25 μm;
with one dorsal, one ventral, and two lateral grooves (How to know the protozoa, 1979).
P. asymmetrica:
18-25 μm;
pyriform, with a deep lateral groove (How to know the protozoa, 1979).
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