Family: Test rigid, chitinoid, often areolar, smooth; pseudostome ventral, round (Illustrated Guide, 1985).
Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Group [Vulgaroides]: Test hemispherical; height 1/2 ~ 4/5 diam.; lacks external shelf or rim.
Species: Test 30-100 μm in diameter; height of test about 1/2 the diameter; dome of hemispherical test evenly convex; pseudostome cicular, central; colorless, yellow, or brown; two vesicular nuclei; several contractile vacuoles (Kudo, 1966).
Test 100-150 μm in diameter, 50-80 high (Illustrated Guide, 1985).

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Test more than 100 μm in diam.
A. vulgaris ? test 140 μm P.st. 31 μm water reservoir near Yamaguchi Univ. near Yamaguchi, 2004	A. vulgaris ? test 150 μm P.st. 35 μm Kannon-numa Shimogo Fukushima, 2004	A. vulgaris ? test 140 μm P.st. 28 μm Near Omine-numa Minakami Fukushima, 2008	A. vulgaris ? test 140 μm P.st. 32 μm Kareki-numa m. Nikko Tochigi, 2008
A. vulgaris 125-137 μm P/T=0.24-0.25 areole μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	A. vulgaris 135 μm P/T=0.2 areole μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	v. multinucleata 127 μm P/T= areole 1.4 μm Japan, 199?	v. multinucleata 117 μm P/T=0.32 areole 1.4 μm Japan, 199?
A. vulgaris 126 μm P/T=0.31 areole μm Kabuto-yama Nishi-no-miya Hyogo, 2004	A. vulgaris 121 μm P/T=0.31 areole 1.5 μm Higashi-hiroshima Hiroshima, 1998	A. vulgaris 120 μm P/T=0.2 Onnenai Kushiro marsh Hokkaido, 2005	A. vulgaris 102 μm P/T=0.2 Oh-Yachi 2 Komado marsh Fukushima, 2007
cell division 115 μm P/T= H/T= areole 1.4 μm Yamagata, 1999 Movies	A. vulgaris 110 μm P/T=0.28 H/T= areole μm Higashi-sano Hakuba Nagano, 2004	A. vulgaris 108 μm P/T=0.31 Dojo-ike Norikura highland Nagano, 2006	A. vulgaris 100 μm P/T=0.24 H/T=0.60 areole μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005
A. vulgaris ? 100 x 44 μm P/T=0.28 H/T=0.44 areole μm Japan, 199?
Test 80-100 μm in diam.
v. angulosa 90-95 x μm P/T=0.2 H/T= Onnenai Kushiro marsh Hokkaido, 2005	v. angulosa x μm P/T= H/T= Kareki-numa Nikko Tochigi, 2008.8	v. angulosa x μm P/T= H/T= Kareki-numa Nikko Tochigi, 2008.9	A. vulgaris 96 x 44 μm P/T=0.31 H/T=0.5 areole μm Uruguay, 1999
A. vulgaris 95 x 40 μm P/T=0.3 H/T=0.4 Myoyo Fukiage Saitama, 2004	A. vulgaris 95 x 40 μm P/T= H/T= Karakemi marsh Omachi Nagano, 2006	A. vulgaris μm P/T= H/T= near L.Nakatsuna Omachi Nagano, 2008
var. penardi ? 88 μm P/T=0.28 H/T= areole 2 x 1.2 μm Shirakawa Fukushima, 1999	A. vulgaris ? μm P/T=0.25 H/T= areole μm Japan, 199?	Arcella sp. cell μm Japan, 1998	Arcella sp. cell μm Japan, 1998
Arcella sp. cell μm Japan, 1998	Arcella sp. cell μm Japan, 1998	Arcella sp. Large var. Japan, 1998	var. penardi ? 90 μm P/T=0.34 H/T= areole μm Japan, 199?
Test 60-80 μm in diam.
A. vulgaris 70-81 μm P/T=0.2 H/T=0.55 Onnenai Kushiro marsh Hokkaido, 2005	cysts, cell division 75-80 μm P/T= H/T= areole μm Yamagata, 1999	A. vulgaris 70 μm P/T=0.26 Mida-ga-hara 6 Gassan (mt) Yamagata, 2006	A. vulgaris 70 μm P/T=0.30 Fujimitashiro Katashina Gunma, 2007
A. vulgaris ? 70 μm φ P/T= H/T= Motono Chiba, 2003	A. vulgaris ? test 62 x 32 μm P/T= H/T= Nanbata-shinden Fujimi Saitama, 2004
A. vulgaris 68 μm φ P/T=0.25 Sukawa highland Kurikoma mountain Akita, 2005	cysts, cell division 65 μm φ P/T=0.25 Kawatabi Narugo Miyagi, 2003	A. vulgaris ? 62 μm φ P/T=0.23 Kannon-numa Shimogo Fukushima, 2005	A. vulgaris ? μm φ P/T= ???
A. vulgaris ? 63-65 x ? μm P/T= three nuclei Uruguay, 1999	A. vulgaris ? test 60, 63 μm P/T=0.23 three nuclei Kagami-gawa G.P. Kochi, 2002	A. vulgaris ? test 63 μm P/T=0.20 Nidanuma Tsuchiyu-onsen Fukushima, 2005	A. vulgaris ? 62 μm φ P/T=0.21 Numa-no-hara m. Madarao highland Niigata, 2005
Test 40-60 μm in diam.
A. vulgaris 58 μm φ P/T=0.31 Tane-ike Togakushi highland Nagano, 2006
A. vulgaris 58 μm φ P/T=0.22 Hakama marsh Madarao highland Niigata, 2005	A. vulgaris 58 μm φ P/T=0.21 Iyari marsh Omachi Nagano, 2005	A. vulgaris ? 50 μm φ P/T=0.30 Akebono marsh Tsuchiyu-onsen Fukushima, 2005	A. vulgaris 60 x 35 μm P/T= near Okubo ike Shinano Nagano, 2004
A. vulgaris 60,64 μm P/T=0.28 Kenashitai Hakkoda mountain Aomori, 2005	A. vulgaris 60 μm P/T=0.18 Kashibaru m.6 Karatsu Saga, 2006	A. vulgaris 55 μm P/T=0.25 Riverside green l. Sawara Chiba, 2004	A. vulgaris 55-60 μm P/T= cell division areole μm Japan, 199?
A. vulgaris 50-60 μm P/T= areole μm Japan, 1998	A. vulgaris 55 μm P/T= areole μm cell division Japan, 1999	A. vulgaris 55 μm P/T=0.31 areole μm USA, 1999	A. vulgaris ? 55 μm P/T=0.20 Ikenokochi marsh Tsuruga Fukui, 2004
A. vulgaris ? 53 μm P/T= Ushidome-ike Norikura highland Nagano, 2005	A. vulgaris ? 49,53 x 15 μm P/T= Numa-no-hara m. Madarao highland Niigata, 2005	A. vulgaris ? 53 μm P/T= Higusa-numa Hikari Chiba, 2003	A. vulgaris ? 53 μm P/T= Watarase Wetland Fujioka Tochigi, 2005
A. vulgaris 48,51 μm P/T= Akebono marsh Tsuchiyu-onsen Fukushima, 2005	A. vulgaris 47, 52 μm P/T= Senjo-ga-hara Nikko Tochigi, 2003	A. vulgaris 45 μm P/T= Senjo-ga-hara Nikko Tochigi, 2003	A. vulgaris cell μm Tokyo, 1998
A. vulgaris 49 μm P/T= Kareki-numa m. Nikko Tochigi, 2008	A. vulgaris 49 μm P/T= Maeyama m. Shiga highland Nagano, 2008
Test 20-40 μm in diam.
A. vulgaris ? 35 μm P/T=0.3 H/T=0.6 Onnenai Kushiro marsh Hokkaido, 2005
Test less than 20 μm in diam.
A. vulgaris ?? 19 μm P/T= areole μm Japan, 1998	A. vulgaris ?? 20 μm P/T= O-ike park Yabuki Fukushima, 2003

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