Arcella sp.
Ehrenberg, 1832
 
Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).  
 
Species: 
 | 
Arcella sp., 
test  μm long,  μm wide, L/W=, pseudostome  μm wide, 
x 640, No.1, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii
 31 μm
 63 μm
 94 μm; x 640
Images of collecting locality: 
No.1, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii
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