Subgenus [ Prostaurastrum ]: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [ var. dickiei ]: Cell body (28-34)-44 μm long (excluding spines), (30-34)-44 μm wide, L/W=1.0, isthmus 7-9 μm wide; semicells nearly elliptical, upper margin more covex than lower margin; each corner with a spine projecting downward; apical view triangular in shape with each side concave.
[ var. circulare ]:
[ var. latum ]: (Illustrations of The Japanese Fresh-water Algae, 1977).

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S. dickiei v. dickiei 31 x 32 μm Onnenai Kushiro marsh Hokkaido, 2005

S. dickiei v. dickiei 27 x 27 μm spines μm Sanda Hyogo, 2001

S. dickiei 21, 24, 26 μm spines μm Uruguay, 1999

Similar species -->> Arthrodesmus convergens (side view only);

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