Family: Test usually more or less compressed; pseudostome narrowly oval or slit-like.
Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
(Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).
test μm long, μm wide, L/W=,
pseudostome μm wide,
x 400, x 640, Fujimitashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, October 6, 2007 by Y. Tsukii
94 μm; x 640