Genus: Pseudostome lacks lobed collar; test round or oval in cross-section;
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).
Difflugia acuminata or D. curvicaulis ?,
test 110 μm long (excluding very short & strongly curved spine ?), 62 μm wide,
L/W=1.8, pseudostome 30 μm wide,
x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
31 μm 63 μm 94 μm; x 640