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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 137 μm in diam. (T), μm high (H), H/T=, pseudostome 33 μm wide (P), P/T=0.24, x 400, x 640, Akebono marsh (or bog), Nidanuma (Nitanuma), Tsuchiyu-onsen, Fukushima city, Fukushima Pref., Japan, October 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella
A dividing cell forming a new test, test 127 μm in diam. (T), about 45 μm high (H), H/W=0.4 (?), pseudostome μm wide (P), P/T=, x 400, x 640
Arcella Arcella Arcella
A dividing cell forming a new test, test 125 μm in diam. (T), μm high (H), H/T=, pseudostome 31 μm wide (P), P/T=0.25, x 400, x 640
Arcella Arcella Arcella
x 640
Arcella Arcella Arcella

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