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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Closterium ehrenbergii
Meneghini var. ehrenbergii

Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. ehrenbergii]: Cell body large, swelled at the center, inner-side straight or slightly convex, 230-(384-416)-880 μm long, 44-(64-84)-170 μm wide, L/W=4-6; chloroplasts with 4-7 laminae, with many pyrenoids scattered (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium ehrenbergii, tape No. 0056, time code 1312, cell body strongly curved, 425 μm long, 78 μm wide, L/W = 5.4, Uruguay, November 1999, photo by Yuuji Tsukii

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