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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 32 μm long, 55 μm wide, pseudostome 15 μm wide, x 640, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella Arcella

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