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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella sp.
Ehrenberg, 1832

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

Arcella sp., test 87 μm in diam., pseudostome about 22 μm in diam., x 640, a small pond near Shin-Akitsu railway station, Higashi-Murayama city, Tokyo, Japan, February 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella Arcella Arcella

Arcella sp., test 85 μm in diam., pseudostome about 22 μm in diam., x 640, a small pond near Shin-Akitsu railway station, Higashi-Murayama city, Tokyo, Japan, February 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella
Arcella Arcella Arcella Arcella

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