Subgenus: Cell body cylindrical or dumbbell-shaped, dorso-ventrally not compressed,
transverse section circular.
Section [ Eudysphinctium ]:
Cell body dumbbell-shaped, constriction strong, cell surface smooth, dotted or punctated
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Cosmarium zonatum P. Lundell,
cell body 46 μm long, 32 μm wide, L/W=1.4, isthmus 9 μm wide,
x 640, No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii