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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum ozense
Hirano

Genus: Variable in shape and in size; mostly longer than wide; strong constriction at center; semicell pyramid-shaped, apically flattened with indentation (or notch, some species lack this notch); laterally straight or wavy or indented; one chloroplast in each semicell; one pyrenoid for each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species: Cell body 125-137 μm long, 48-50 μm wide, L/W=2.5, isthmus 19-20 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
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