Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: Test 60-85 μm long, about 30 μm wide (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).

->> Description at WPRNO

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D. penardi 83 x 49 μm L/W=1.7 Tane-ike Togakushi highland Nagano, 2005	D. penardi 70, 90 μm L/W= Japan, 1998	D. penardi 85 μm L/W= Omine-numa Tsukiyono Gunma, 2003	D. penardi 76 x 50 μm L/W=1.5 Lake Shirakaba Tateshina & Chino Nagano, 2005
D. penardi 75 x 50 μm L/W=1.5 Kannon-numa Shimogo Fukushima, 2005	D. penardi 114 x 58 μm L/W=2.0 Kannon-numa Shimogo Fukushima, 2008	D. penardi μm L/W= Omine-numa 6 Minakami Gunma, 2008	D. penardi 78 x 53 μm L/W=1.5 Jionji-shinsui p. Iwatsuki-ku Saitama, 2006
D. penardi μm L/W= Kashibaru m.5 Karatsu Saga, 2006	D. penardi μm L/W= Kashibaru m.4 Karatsu Saga, 2006

Similar species -->> Difflugia lucida Penard;

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