Family: Pseudostome terminal, variable in shape.
Genus: Pseudostome lacks lobed collar; test round or oval in cross-section;
with or lacking a collar (Illustrated Guide, 1985).
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Difflugia, x 400, Uruguay Nov. 1999, photo by Y. Tsukii
