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. claviformis 288 x 110 μm L/W=2.6 Tashirodaira m. Hakkoda mountain Aomori, 2005	D. claviformis 290 x 85 μm L/W=3.4 Nidanuma Tsuchiyu-onsen Fukushima, 2005	D. claviformis 270 x 50 μm L/W=5.4 Japan, 199?	D. claviformis ? 145 x 25 μm L/W= Ohnuma Nasu-shiobara Tochigi, 2006
D. claviformis 250 x 105 μm L/W=2.4 Suijo Park Gyoda Saitama, 2006
D. claviformis 290 x 90 μm L/W=3.2 Sankaku-ike Shiga highland Nagano, 2004	D. claviformis 240 x 83,90 μm L/W=2.7, 2.9 Ushidome-ike Norikura highland Nagano, 2005	D. claviformis ? 210 x 90 μm L/W=2.3 Ushidome-ike Norikura highland Nagano, 2005	D. claviformis 250 x 95 μm L/W=2.6 Dojo-ike Norikura highland Nagano, 2006
D. claviformis 250 x 100 μm L/W=2.5 Hasu-ike Shiga highland Nagano, 2005	D. claviformis 275 x 75 μm L/W=3.7 Lake Nakatsuna 2 Omachi Nagano, 2007	D. claviformis 316 x 100 μm L/W=3.2 Suga-daira m. Ueda Nagano, 2006	D. claviformis μm L/W= Benten-ike Nikko Tochigi, 2008

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

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