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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella sp.

Arcella Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species:

Arcella sp. (A. megastoma (Penard 1902) emend Wailes 1913 ?), test 283 μm in diam., μm high, pseudostome 105 μm wide, P/W=0.4, x 400, x 640, Onnenai, Kushiro marsh, Kushiro city, Hokkaido, Japan, October 16, 2005 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
Arcella Arcella Arcella Arcella Arcella

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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