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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella sp.
Ehrenberg, 1832

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

Arcella sp., test 83 μm long, 39 μm wide, x 640, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, July 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella

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