Family: Unicells; cell body spherical or broad ellipsoidal; chloroplasts 1 to several in number, cup-shaped or plate-like, reticulated or star-shaped; with or without pyrenoids; reproduction by autospores and zoospores; many species found in soil (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular, planktonic; cell body flat tri- or quadrangular in shape, with hairy projections at each point; a single chloroplast plate-like in shape, with a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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P. spinulosa cell 16 μm Koshigaya Saitama, 2001	P. spinulosa cell 16 μm Koshigaya Saitama, 2001	P. spinulosa cell 12 x 13 μm Showa-machi g.p. Showa Saitama, 2006	P. spinulosa ? cell μm Flower park Ashikaga Tochigi, 2003
P. spinulosa ? cell μm Kijioka Castle Ruin Kodama Saitama, 2003	P. spinulosa ? cell μm Nanbata castle p. Fujimi Saitama, 2005
Polyedriopsis sp. cell 23 μm Shirakawa Fukushima, 1999	Polyedriopsis sp. cell 31 μm Uruguay, 1999

Similar genus -->> Tetraedron; Pseudopolyedriopsis;

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