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Lobosea: Testacealobosia: Arcellinida: Difflugiidae

Difflugia acuminata
Ehrenberg

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
Difflugia
D. acuminata
235 x 90 μm
L/W=2.6
USA, 1999
Difflugia acuminata
D. acuminata
or D. claviformis ?
300 x 80 μm
L/W=3.8
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
Difflugia
D. acuminata
or D. claviformis ?
160 x 41 μm
L/W=3.9
Yamaguchi Univ.
Yamaguchi, 2004
Difflugia acuminata
v. curvata
or D. oblonga ?
260-290 x 92-110 μm
L/W=2.6-2.8
Suiren-numa
Hakkoda mountain
Aomori, 2005
Difflugia
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
Difflugia accuminata
D. acuminata
or D. bacillariarum ?
215 x 75 μm
L/W=
near Ohnuma
Nasu-shiobara
Tochigi, 2006
Difflugia
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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Difflugia acuminata
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