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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium sp.

Cosmarium 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.
Subgenus [ Eucosmarium ]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Globuliferae ]: Cell surface smooth; semicells circular, ellipsoidal, reniform (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium contractum Kirchner var. ??, cell body 55 μm long, 40 μm wide, L/W=1.4, isthmus 17 μm wide, x 640, Kanayama chosei-chi (pond), Kiyose city, Tokyo, Japan, January 15, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium contractum Cosmarium contractum

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