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: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)
Species: Cell body 48 μm long, 40 μm wide, L/W= (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. ceylanicum 80 x 60 μm Yamakado m. Nishi-Azai Shiga, 2008  |
E. egregium or Similar species ? 60 x 60 μm Water reservoir Iiyama Nagano, 2008 |
