Genus (Dujardin, 1841): Test round or oval in cross-section; pseudostome anteroventral; scales in regular rows (Illustrated Guide, 1985). Species: Test 25-60 μm long, 14-40 μm wide, pseudostome 6.5-16 μm wide (Cash, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.1, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii