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 140-280 μm long, 90-170 μm wide, 40-80 μm in thickness; with flange compressed to thin shelf, usually not extended along neck, pseudostome 28-50 &956;m long, 12-15 μm wide (Illustrated Guide, 1985).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.3, Yokotashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, August 3, 2008 by Y. Tsukii