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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella vulgaris
Ehrenberg, 1832

Arcella vulgaris Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Group [Vulgaroides]: Test hemispherical; height 1/2 ~ 4/5 diam.; lacks external shelf or rim.
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, test 75 μm in diam., 41 μm high, H/T=0.55, pseudostome 16 μm wide, P/T=0.2, x 640, Onnenai, Kushiro marsh, Kushiro city, Hokkaido, Japan, October 16, 2005 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 μm in diam., μm high, H/W=, pseudostome μm wide, P/W=, x 640
Arcella Arcella
Test 70 μm in diam., μm high, H/W=0.7, pseudostome 15 μm wide, P/W=0.2, x 640
Arcella Arcella
Test μm in diam., μm high, H/W=, pseudostome μm wide, P/W=, x 640
Arcella Arcella Arcella Arcella
Arcella Arcella
Test 81 μm in diam., 55 μm high, H/W=0.7, pseudostome 16 μm wide, P/W=0.2, x 640
Arcella Arcella Arcella Arcella

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