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) Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977) Species: Cell body 22-(26-34)-43.5 μm long, 21-(23.7-31)-37.5 μm wide; constriction 7.5-(8.4-9.8)-12 μm wide; cell wall smooth (Illustrations of the Fresh-water Algae, 1977).

Similar species -- >> S. lapponicum f. lapponicum;

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Staurastrum muticum Brébisson (or Staurastrum lapponicum (Schmidle) Grönblad), abnormal cell division ?, cell body μm long, μm wide, x 640, Showa Memorial Park, Tachikawa-ku, Tokyo, Japan, November 2001 by Y. Tsukii

Staurastrum muticum Brébisson: Cell body 22-(26-34)-43.5 μm long, 21-(23.7-31)-37.5 μm wide; constriction 7.5-(8.4-9.8)-12 μm wide; cell wall smooth (Illustrations of the Fresh-water Algae, 1977).

Staurastrum lapponicum (Schmidle) Grönblad: Cell body 28-42 μm long, 28-39 μm wide; constriction 8.4-11 μm wide; cell wall covered with granules, arranging in circle around each corner (Illustrations of the Fresh-water Algae, 1977).