Suborder : Cells naked (Illustrated Guide, 1985).
Genus (Aragoa): Cell body ovoid or pyriform with conical or pointed posterior end; 4 equal-length flagella inserted at the base of a papilla; cells colorless; eyspot present or absent; 1-layered cysts common; 2 anterior contractile vacuoles; cell division by longitudinal fission; sexual reproduction isogamous to form a 4-flagellate zygote (Illustrated Guide, 1985).

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P. parva xenic culture cell swelled flag. μm Miyadera Iruma Saitama, 2003	P. parva axenic culture cell ovoid flag. μm Miyadera Iruma Saitama, 2003	P. parva stock Sim-19 cell ovoid flag. μm Miyadera Iruma Saitama, 2003	P. parva stock Sim-11 cell ovoid flag. μm Miyadera Iruma Saitama, 2003
P. parva μm xenic culture Near Chyokyu-ji Iruma Saitama, 2003	P. parva stock Sim-1 & -2 axenic culture Near Chyokyu-ji Iruma Saitama, 2003

Similar genus -->> Tetrablepharis (Chlamydomonadales: Chlamydomonadaceae);

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