Family: Test rigid, chitinoid, often areolar, smooth; pseudostome ventral, round (Illustrated Guide, 1985).
Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).

A. vulgaris or A. discoides ? 11 clips test μm φ Higashi-hiroshima Hiroshima, 1998	A. vulgaris (9 clips) test μm φ Higashi-hiroshima Hiroshima, 1998	A. vulgaris 3 clips 115 μm φ Yamagata Yamagata, 1999
A. vulgaris 3 clips test μm φ Japan, 1998	A. vulgaris 7 clips test μm φ Japan, 1998	A. vulgaris (5 clips) test μm φ Japan, 1998
A. vulgaris 5 clips test μm φ Japan, 1998	A. vulgaris 4 clips test μm φ Japan, 1998	A. vulgaris (6 clips) test μm φ Japan, 1998
A. vulgaris 3 clips xxxx xxxx Pref, Year	A. vulgaris ? 6 clips test μm φ Tokyo, 1998	A. vulgaris ? (5 clips) test μm φ Tokyo, 1998
A. gibbosa 8 clips test μm φ Kuroiso Tochigi, 1998	A. gibbosa (7 clips) test μm φ Kuroiso Tochigi, 1998
A. hemisphaerica 5 clips test μm φ Japan, 1998	Arcella sp. (2 clips) test μm φ Japan, 1998	Arcella sp. (3 clips) test μm φ Japan, 1998

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