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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium clepsydra

Cosmarium clepsydra 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: Cell body small, 18-(19.6-29.4) μm long, 18-(19.6-25) μm wide, isthmus 4.5-(5.6-7) μm wide; semicells somewhat reniform, apex convex, apical view elongated elliptical, with small projections at both sides (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium clepsydra Nordstedt (or Cosmarium bireme Nordstedt or C. phaseolus f. minor ?), cell body 16 μm long, 14.5 μm wide, isthmus 4 μm wide, x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium clepsydra Cosmarium clepsydra Cosmarium clepsydra

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