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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium trilobulatum
Reinsch var. trilobulatum

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 [Pyramidatae]: Cell surface smooth; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium trilobulatum Reinsch var. trilobulatum (or C. hammeri Reinsch var. hammeri ? or C. nymannianum Grunow ? or C. eductum Roy et Bissset ?), cell body 35 μm long, 23 μm wide, isthmus 10 μm wide, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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