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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella artocrea

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

Arcella artocrea (Arcella catinus ?), test 180 μm in diam., pseudostome 30 x 33 μm, x 400, x 640, Sankaku-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella

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