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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella hemisphaerica
Perty, 1852

Arcella hemisphaerica Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species: 30-70 μm diam., 25-40 μm high; pseudostome round, 10-20 μm, invaginated 8-10 μm, short inverted rim; test finely areolar, yellow to brown (Illustrated Guide, 1985).

Arcella hemisphaerica (or Centropyxis sp. ?), test 66 μm diam., 25 μm high, pseudostome 25 μm diam. more or less anterior, test not chitinoid ?, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Arcella Arcella Arcella Arcella

Arcella hemisphaerica, x 400, by Y. Tsukii
Arcella Arcella Arcella Arcella Arcella Arcella Arcella

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