Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: Size, 200-400 μm long, 55-100 μm diam; test, cylindroid, narrowed toward pseudostome, tapered at base to spinelike tip; round cross-section; clear; imbedded quartz particles. Pseudostome truncate, round 40-90 μm, no neck, no collar (Illustrated Guide, 1985).

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D. acuminata 175 x 66 μm L/W=2.7 Uruguay, 1999	D. acuminata 235 x 90 μm L/W=2.6 USA, 1999	D. acuminata or D. claviformis ? 300 x 80 μm L/W=3.8 Kabuto-yama Nishi-no-miya Hyogo, 2004	D. acuminata or D. claviformis ? 160 x 41 μm L/W=3.9 Yamaguchi Univ. Yamaguchi, 2004
v. curvata or D. oblonga ? 260-290 x 92-110 μm L/W=2.6-2.8 Suiren-numa Hakkoda mountain Aomori, 2005	D. acuminata or D. curvicaulis ? 155 x 75 μm 110 x 62 μm L/W=2.1,1.8 Numa-no-hara m. Madarao highland Niigata, 2005	D. acuminata or D. bacillariarum ? 215 x 75 μm L/W= near Ohnuma Nasu-shiobara Tochigi, 2006	D. acuminata or D. claviformis ? μm L/W= Kannon-numa Shimogo Fukushima, 2008

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

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