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).
Images of collecting locality:
Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii