Species: Cell body medium in size, slightly curved, centrally straight, gradually tapered toward ends, both ends truncated with rounded corners, 163-(190-350) μm long, 8-(8.4-13)-20 μm wide, L/W = 25-32; cell wall smooth, bands absent; chloroplasts with 5-7 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii

Closterium toxon W. West, cell body μm long, μm wide, L/W=, x 200, x 400, x 640, No.1, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.1, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii