Genus: Pseudostome lacks lobed collar; test round or oval in cross-section;
pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: Test pyriform, flask-shaped, or ovoid; neck variable in length;
aperture terminal, typically circular; test composed of angular sand-grains, diatoms;
60-580 μm by 40-240 μm (Kudo, 1966).
Similar species -->>D. scaplellum;
D. acuminata;
Difflugia oblonga Ehrenberg,
test 105 μm long, 40 μm wide, L/W=2.6, pseudostome 27 μm wide,
pseudostome μm wide, P/W=,
x 640, Jionji-shinsui-koen (Jion temple water park), Iwatsuki-ku (formerly Iwatsuki city), Saitama city, Saitama Pref., Japan, February 12, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Jionji-shinsui-koen (Jion temple water park), Iwatsuki-ku (formerly Iwatsuki city), Saitama city, Saitama Pref., Japan, February 12, 2006 by Y. Tsukii