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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella vulgaris
Ehrenberg, 1832

Arcella Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species: Test 30-100 μm in diameter; height of test about 1/2 the diameter; dome of hemispherical test evenly convex; pseudostome cicular, central; colorless, yellow, or brown; two vesicular nuclei; several contractile vacuoles (Kudo, 1966).
Test 100-150 μm in diameter, 50-80 high (Illustrated Guide, 1985).

Arcella vulgaris smaller variety, test 63 μm in diam., μm high, with three nuclei, x 400, x 640, Uruguay, November 1999, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella Arcella
Test 65 μm in diam., μm high, x 400, x 640
Arcella Arcella
Test 63 μm in diam., μm high, x 400, x 640
Arcella Arcella Arcella

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