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: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977) Species [var. pelagicum ]: Semicells elongate cup-shaped (excluding arms); cell body 40-46 μm long (excluding arms), 50-65 wide (including arms), isthmus 12-13 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

31 μm 63 μm 94 μm; x 640

Daughter cells after cell division

Staurastrum anatinum (or S. dorsidentiferum ?), stock Fsn-1, axenic culture with KCM and Hyponex (December 13, 2001 to January 19, 2002), after a prolonged culture, shape of the cells changed to that of S. pseudosebaldi, cell body μm long, μm wide, x 640, Naga-ike (pond), Shinbaru, Sue-machi (Sue town), Fukuoka Pref., Japan, October 2001 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Dividing cells

A cell with long (anatinum-type) and short (pseudosebaldi-type) arms