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).

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S. kouwetsii 42 x 42 μm Onnenai Kushiro marsh Hokkaido, 2005	S. kouwetsii 40 x 40 μm Onnenai Kushiro marsh Hokkaido, 2005	S. kouwetsii 43 x 38 μm Hachiman-numa m. Hachimantai Iwate, 2006	S. kouwetsii ? x 41 μm Sukawa highland Kurikoma mt. Iwate, 2007
S. kouwetsii μm Kuroyachi marsh 1 Hachimantai Iwate, 2007	S. kouwetsii 48 x 40 μm near Meigetsuso Azuma mountains Yamagata, 2007	S. kouwetsii 47 x 44 μm Ikei-no-ike Nasu Tochigi, 2006	S. kouwetsii 50 x 48 μm Watarase Wetland Fujioka Tochigi, 2005
S. kouwetsii μm Senjo-ga-hara Nikko Tochigi, 2003	S. kouwetsii 52 x 52 μm Oyomi marsh Hakuba Nagano, 2006

Similar species --> > S. brebissonii; S. teliferum; S. hirsutum;

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