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).
[ var. curvata ]: Test pyriform, curved, with a short cylindrical neck, a blunt mamillary projection on the crown, 240 μm long, 110 μm wide (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Difflugia accuminata Ehrenberg ,
cell body μm long, μm wide, L/W=,
x 640, No.11, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii
50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640
Images of collecting locality:
No.2, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii