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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella sp.
Ehrenberg, 1832

Arcella Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985). (Illustrated Guide, 1985).
Group: Discoides (Test flattened; height < 1/2 greatest diam.)
Species:

Arcella sp., test μm long, 50 μm wide, x 640, rice field, Tennoh, Tessei-cho, Okayama Pref., Japan, November 22, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella
Arcella Arcella Arcella Arcella
Arcella Arcella
Arcella Arcella Arcella

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