Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species:

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D. bacillariarum ? 260-360 x μm L/W=3.4-3.6 Onnenai Kushiro marsh Hokkaido, 2005	D. bacillariarum 150 x 75 μm L/W=2.0 Kenashitai Hakkoda mountain Aomori, 2005	D. bacillariarum 135 x 65 μm L/W=2.1 Shibayachi m.5 Odate Akita, 2007	D. bacillariarum 175 x 78 μm L/W=2.2 Oze-ga-hara Katashina Gunma, 2006
D. bacillariarum 190 x 80 μm L/W=2.4 Yokotashiro 1 Katashina Gunma, 2007	D. bacillariarum 150-170 x μm L/W= Hakama marsh Madarao highland Niigata, 2005	D. bacillariarum 170 x 80 μm L/W=2.1 Numa-no-hara m1 Madarao highland Niigata, 2007
D. bacillariarum 190 x 83 μm L/W=2.3 Ushidome-ike Norikura highland Nagano, 2005	D. bacillariarum 180 x 70 μm L/W=2.6 Iyari marsh Omachi Nagano, 2005	D. bacillariarum 140 x 70 μm L/W=2.0 Midoriga-ike Togakushi highland Nagano, 2006
D. bacillariarum 185 x 75 μm L/W=2.5 Mumei marsh Shiga highland Nagano, 2006	D. bacillariarum 175 x 55 μm L/W=3.2 Tanohara marsh Shiga highland Nagano, 2005	D. bacillariarum 140,170 x μm L/W=2.3,2.4 Tanohara marsh Shiga highland Nagano, 2006	D. bacillariarum 180 x 70 μm L/W=2.6 Shimo-no-koike Shiga highland Nagano, 2007
D. bacillariarum 165 x 60 μm L/W=2.8 Imou bog Toyohashi Aichi, 2004	D. bacillariarum 150 x 70 μm L/W=2.1 Imou bog Toyohashi Aichi, 2006.4	D. bacillariarum 190 x 60 μm L/W=3.2 Imou bog Toyohashi Aichi, 2006.9

Similar species >> D. bacillifera; D. claviformis; D. acuminata; D. scalpellum;

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