Family: Unicells; cell wall present; two flagella (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Similar to Chlamydomonas, but lacks chloroplasts; leucoplasts present instead; two equal-length flagella; usually with many starch granules; pyrenoid absent; stigma present or absent; 2 or 4 contractile vacuoles anteriorly located; asexual reproduction by zoospores; sexual reproduction iso- or anisogamous (Illustrated Guide, 2000).

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P. tetraolare cell μm flag. μm Ageo city Saitama, 2003	P. tetraolare cell μm flag. μm Yoshimi town Saitama, 2003	P. tetraolare stock Syk-3 dividing cells Yoshimi town Saitama, 2003	P. tetraolare stock Syk-1 Yoshimi town Saitama, 2003
P. tetraolare cell 16 x 9 μm flag. 24 μm Iruma river Sayama Saitama, 2004	P. tetraolare cell 14-18 x 8-10 μm flag. μm Takao-sakura p. Kitamoto Saitama, 2005	P. tetraolare stock Skit-1, -1b cell 12-20 x μm Takao-sakura p. Kitamoto Saitama, 2005

Similar genus -->> Polytomella;

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