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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella gibbosa
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: 70-120 μm diam., 50-75 μm high; test yellow, brwon to black with age; pseudostome round, invaginated; dorsal surface dimpled (Illustrated Guide, 1985).

Arcella sp. (gibbosa ?), test 62 μm in diam., x 640, Seseragi park, Karasu-gawa-ryokuchi (riverside green land near Karasu river), Fujioka city, Gunma Pref., Japan, December 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella

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