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

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Arcella sp. A. arenaria ? test 105 μm P.st. 18 μm Tane-ike Togakushi highland Nagano, 2006	Arcella sp. A. arenaria ? test 103 μm P.st. 18 μm Yoshi-numa Nasu-shiobara Tochigi, 2006	Arcella sp. A. arenaria ? test 91 μm P.st. 17 μm Ohnuma Nasu-shiobara Tochigi, 2006	Arcella sp. A. arenaria ? test μm P.st. μm Kareki-numa m. Nikko Tochigi, 2008
Arcella sp. A. arenaria ? test 87 μm P.st. 17 μm Aquatic botanical g. Sawara Chiba, 2004	Arcella sp. test 72 μm P.st. 17 μm Riverside green l. Sawara Chiba, 2004

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