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Chlorophyta:Gamophyceae: Zygnematales: Desmidiaceae

Triploceras gracile

Genus: Cell body long, with a constriction at its center; each half-cell laterally straight or wavy; rings of spines at each peak of the waves (similar to Pleurotaenium nodosum or P. kayei); 2-4 arm-like projections at each end; chloroplasts consisting of a central rod and radial laminae; pyrenoids aligned at the rod (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 206- (310-360) -668 μm long, (20-28) -53 μm wide (including spines), L/W=10-15; semicells not swelled at base, slightly tapered at terminal, wavy lateral margin with short spines, 2 arm-like projections at each end, each projection equipped with two spines; cell wall smooth; axial chloroplasts with radially-arranged laminae (Illustrations of The Japanese Fresh-water Algae, 1977).

Triploceras gracile ?, tape No. 0064, time code 0000, cell body 363 μm long, μm wide, Hiroshima Pref., Japan, 1998 by Y. Tsukii

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