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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella megastoma
(Penard 1902) emend Wailes 1913

Arcella Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species: Diam. 180-360 μm, height 36-55 μm; pseudostome, round, 70-190 μm; with ring of pores (Illustrated Guide, 1985).

Arcella megastoma (Penard 1902) emend Wailes 1913, test 250 μm in diam., pseudostome 120 μm in diam., x 640, Toneri Park, Adachi-ku, Tokyo, Japan, December 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
x 100, x 200, x 400
Arcella disccoides Arcella disccoides Arcella disccoides Arcella disccoides
x 640
Arcella disccoides Arcella disccoides

Arcella discoides Ehrenberg, 1871: Diam. 90-150 μm, height 25-30 μm; pseudostome, round, 30-40 μm; with or without ring of pores (Illustrated Guide, 1985).

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