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). Species: Test 130 μm long, 86-90 μm wide (Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No. 1, Iyari marsh, Omachi city, Nagano Pref., Japan, June 1, 2008 by Y. Tsukii