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

->> Description at WPRNO

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Group: Altoides (Test taller than greatest diam.)

Arcella sp. 125 x 115 μm 124 x 105 μm 115 x 115 μm Uruguay, 1999	A. mitrata ? 120 x 135 μm Hyoutan-ike Shiga highland Nagano, 2005	A. mitrata ? x 130 μm Mida-ga-hara Gassan (mt) Yamagata, 2006	A. mitrata ? μm Hanadate South WL Yuri-Honjo Akita, 2008
A. mitrata ? 70-77 x 60-71μm Uruguay, 1999

Group: Vulgaroides (Test hemispherical; height 1/2 ~ 4/5 diam.; lacks external shelf or rim)

Arcella sp. 107 x 85 μm Uruguay, 1999	Arcella sp. 90-95 x 68 μm near Okubo ike Shinano Nagano, 2004	Arcella sp. μm Maimeno-ike 1 Norikura highland Nagano, 2007	Arcella sp. 32 x 55 μm Numa-no-hara m. Madarao highland Niigata, 2005
A. vulgaris 72 samples test 19-150 μm 199?-2008	A. vulgaris 72 samples test 19-150 μm 199?-2008	A. vulgaris 72 samples test 19-150 μm 199?-2008	A. vulgaris 72 samples test 19-150 μm 199?-2008
A. gibbosa ? test 85-87 μm Shin-Akitsu Higashi-Murayama Tokyo, 2004	A. gibbosa 24 samples 50-100 μm φ 199?-2008	A. gibbosa 24 samples 50-100 μm φ 199?-2008	A. gibbosa 24 samples 50-100 μm φ 199?-2008
A. hemisphaerica ? 3 samples test 66 μm Japan, 1988	Arcella sp. test μm Uruguay, 1999	Arcella sp. test μm Uruguay, 1999

Group: Discoides (Test flattened; height < 1/2 greatest diam.)

Arcella sp. test 283 μm Onnenai Kushiro marsh Hokkaido, 2005	A. megastoma test 250 μm Toneri Park Adachi-ku Tokyo, 2001	A. megastoma test 316, 280 μm Toneri Park Adachi-ku Tokyo, 2005	A. discoides 6 samples 83-165 μm 1999-2005
A. dentata 6 samples 125-155 μm 2003-2008	A. artocrea ? 5 samples 150-193 μm 2005-2007	A. catinus or A. arenaria ? test 113 μm P.st. 32 μm Numa-no-hara m. Madarao highland Niigata, 2005
A. arenaria ? 6 samples 72-105 μm 2004-2008	Arcella sp. test 103 μm P.st. 26 μm Numa-no-hara m. Madarao highland Niigata, 2005	Arcella sp. test 130 μm P.st. 55 μm Kurome river Asaka Saitama, 2006	Arcella sp. test 100 μm P.st. 47 x 19 μm Ikenokochi m.4 Tsuruga Fukui, 2006
Arcella sp. test 81 μm P.st. 43 x 19 μm Karakemi m.1 Omachi Nagano, 2007	Arcella sp.1 4 samples 83-87 μm 2005-2008	Arcella sp. test 67 x 58 μm P.st. 23 x 21 μm near Lake Aoki Omachi Nagano, 2006	Arcella sp.2 4 samples test 50-70 μm 2004-2005

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