Arcella vulgaris
Ehrenberg, 1832
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).
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Arcella vulgaris Ehrenberg ?,
test 60 μm in diam., pseudostome 17 μm in diam.,
x 640, Kenashitai (marsh), Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Arcella vulgaris Ehrenberg ?,
test 64 μm in diam., μm high, pseudostome 18 μm wide, P/W=0.3,
x 640, Kenashitai (marsh), Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
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