Genus: Test round or oval in cross-section; pseudostome terminal with dentate scales (Illustrated Guide, 1985). Species: Test 33-70 μm long, 12-23 μm wide; pseudostome 6-12 μm wide; (Cash & Wailes, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.7, Oh-numa marsh, Akita-Hachimantai, Kazuno city, Akita Pref., Japan, September 21, 2007 by Y. Tsukii