Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Group: Discoides (Test flattened; height < 1/2 greatest diam.)
Species: Diam. 90-150 μm, height 25-30 μm; pseudostome, round, 30-40 μm; with or without ring of pores (Illustrated Guide, 1985).

->> Description at WPRNO

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A. discoides test 132 μm Uruguay, 1999	A. discoides test 120 μm Omine-numa Tsukiyono Gunma, 2003	A. discoides test 110 μm Uruguay, 1999	A. discoides test 165 μm Obihiro-Hasshonochi Obihiro Hokkaido, 2005
A. discoides test 95 μm Uruguay, 1999	A. discoides test 83 μm Japan, 199?

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