Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977) Species: Cell body 42-50 μm long, 42-50 μm wide, St. kowetsii resembles St. brebissonii but differs by stouter and less closely inserted cell wall spines (Coesel & Meesters, Desmids of the Lowlands, KNNV Publishing, 2007).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: a small marsh pond at Iwakagami-gunseichi (gregarious flowering area of Scizocodon soldanelloides), near Nagori-ga-hara (bog), Sukawa highland, Kurikoma mountain, Ichinoseki city, Iwate Pref., Japan, June 24, 2007 by Y. Tsukii