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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium dorsitruncatum
(Nordstedt) G.S. West

Cosmarium dorsitruncatum Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Cosmarium dorsitruncatum (Nordstedt) G.S. West (large variety ?), similar to C. circulare var. minor, cell body 46 μm long, 50 μm wide, x 640, Kejo-numa, Furukawa city, Miyagi Pref., Japan, November 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium dorsitruncatum Cosmarium dorsitruncatum

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