| Arcella | |
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| Arcella sp. test (top view) | |
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| Genus: | Arcella Ehrenberg, 1832
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Arcella is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of Arcella is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera.