Arcella sp.
Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species:
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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
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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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