Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)

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Subgenus: Prostaurastrum (lacks arm-like projections)
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Subgenus: Eustaurastrum (with arm-like projections)
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Unidentified
Staurastrum sp. x 640 Uruguay, 1999	Staurastrum sp. x 640 Uruguay, 1999	Staurastrum sp. Mitsuishi marsh Hachimantai Iwate, 2008

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