Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large,
with or lacking a collar (Illustrated Guide, 1985).
Species:
Difflugia claviformis Ehrenberg,
cell body μm long, μm wide, L/W=,
x 640, Benten-ike, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
50 μm
100 μm
150 μm; x 400 ;
31 μm
63 μm
94 μm; x 640