Family: Pseudostome terminal, variable in shape.
Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; with or lacking a collar (Illustrated Guide, 1985).

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Group: Lobostomoides (Test with short neck, round in cross-section; pseudostome oval or polygonal)
D. corona 8 samples test 105-188 μm L/W=0.9-1.0 199?-2005	D. tuberculata 2 samples test 169 x 131 μm L/W=1.3 199?-2003	D. lobostoma 15 samples test 78-112 μm L/W=1.3-1.5 199?-2004	D. lobostoma ? 74 x 70, 94 x 75 L/W=1.1, 1.3 Higashi-sano Hakuba Nagano, 2004
D. lanceolata 140 x 86 μm L/W=1.6 Tanohara marsh Shiga highland Nagano, 2005	D. limnetica 10 μm ? L/W=	D. pristis 5 samples 50-75 μm L/W=1.2-1.9 2004-2005	Difflugia sp. D. pristis ? 58-80 x 43-63 μm L/W=1.3-1.4 Uruguay, 1999
Group: Compressoides (Test lacks neck or collar, oval in cross-section; pseudostome oval to round)
Difflugia sp. 95 x 43 μm L/W=2.2 Myoyo Fukiage Saitama, 2004	D. mammilaris 10 samples 39-120 μm L/W=1.3-1.9 199?-2005	D. mammilaris 10 samples 39-120 μm L/W=1.3-1.9 199?-2005	Difflugia sp. 240 x 160 μm L/W= Aizu Recreation p. Aizuwakamatsu Fukushima, 2005
D. Penardi 10 samples 70-85 x μm L/W= 1998-2008	Difflugia sp. D. Penardi ? 82 x 50 μm L/W=1.6 Uruguay, 1999
Group: Urceoloides (Test with outrolled collar; pseudostome round)
D. urceolata 214 x 180 μm L/W=1.2 Iida-shinden Nishi-ku Saitama, 2004	D. amphora 205 x 150 μm L/W=1.4 Iida-shinden Nishi-ku Saitama, 2004
D. amphora ?? or D. oviformis ? 144 x 120 μm L/W=1.2 Japan, 1998	D. amphora ?? or D. oviformis ? μm L/W= Shinbaru Fukuoka, 2001	D. amphora ?? or D. oviformis ? μm L/W= Japan, 1998
Group: Globuloides (Test globular, lacks neck or collar; pseudostome nearly as wide as body)
D. lebes μm L/W= Japan, 199?
Group: Ovoglobuloides (Test ovoglobular; pseudostome smaller than diam of test)
D. globulosa 17 samples 25-63 x μm L/W=1.0-1.3 199?-2008	D. globulosa ? μm L/W= Hiroshima, 1998	D. globulosa ? μm L/W= Japan, 1999	Difflugia sp. 75 x 80 μm L/W= Karakemi marsh Yasaka Nagano, 2005
Group: Acutoides (Test cylindroid with pointed base; pseudostome round)
D. scalpellum 4 samples 185-225 μm L/W=3.6-4.2 1998-2008
Group: Cornoides (Test elongate with spine from base and/or sides; pseudostome round)
D. acuminata 8 samples 165-290 μm L/W=2.1-3.9 199?-2006	D. acuminata ? 8 samples 165-290 μm L/W=2.1-3.9 199?-2005	Difflugia sp. 240 x 100 μm L/W= Oze-ga-hara Katashina Gunma, 2006	Difflugia sp. 320-352 μm L/W=1.7-2.1 Iroha-numa Azuma Mt. Yamagata, 2007
D. claviformis 13 samples 145-316 μm L/W=2.3-5.4 199?-2008	D. bacillariarum 17 samples 150-190 μm L/W=2.0-2.8 2004-2007	D. elegans or D. curvicaulis ? 25 samples 90-190 μm L/W=1.5-2.2 1998-2008
Group: Pyriformoides (Test with long neck; pseudostome round)
D. pyriformis 20 samples 88-410 μm L/W=1.3-3.1 199?-2008	D. pyriformis 20 samples 88-410 μm L/W=1.3-3.1 199?-2008	D. oblonga 52 samples 40-370 μm L/W=1.7-2.5 199?-2007	D. oblonga 52 samples 40-370 μm L/W=1.7-2.5 199?-2007
D. bacillifera ? 6 samples 110-170 x μm L/W=1.9-2.2 2006-2008
Group: ???
Difflugia sp. 150 x 145 μm L/W=1.0 Kusatsu Onsen b.t. Kusatsu Gunma, 2005	Difflugia sp. 140 x 135 μm L/W=1.0 Lake Shirakaba Tateshina & Chino Nagano, 2005	Difflugia sp. 105 x 105 μm L/W=1.0 Uruguay, 1999	Difflugia sp. 87 x 78 μm L/W=1.1 Japan, 1998 Movies
D. biwae μm L/W= Lake Biwa Shiga	D. bipes ? 150 x 30 μm Maimeno-ike Norikura highland Nagano, 2006	D. bipes ? 135 x 90 μm L/W=1.5 Univ. A.V.M. Obihiro Hokkaido, 2005	D. bipes ? 130 x 80 μm L/W=1.6 Uruguay, 1999
D. crassa ? 180 x 180 μm Mida-ga-hara 7 Gassan Yamagata, 2006	Difflugia sp. or Oopyxis μm L/W= Japan, 199?	misc. μm L/W=

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