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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella vulgaris
var. penardi (Ehrenberg, 1832) Deflandre, 1928

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 var. penardi, test 88 μm (T), pseudostome central, slightly irregular in shape, 25 μm diam. (P), P/T=0.28, x 400, x 640, Shirakawa, Fukushima Pref., Japan, October 1999, collected by H. Shiomizu, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
areoles ellipsoidal 2.0 μm long, 1.2 μm wide
Arcella Arcella Arcella Arcella Arcella
Arcella Arcella Arcella Arcella Arcella
Arcella Arcella Arcella Arcella

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