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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella arenaria

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

Arcella arenaria or A. catinus ?, test 87 μm in diam., pseudostome 17 μm in diam., x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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