Genus: Test more or less compressed; pseudostome elliptical on end of a clear collar (Illustrated Guide, 1985). Species: Test clear, elliptical, 30-60 μm long, 20-50 μm diam.; collar height 8-10 μm; scales overlapping, elliptical; pseudostome oval slit, 10-22 μm wide; nucleus spherical 20-25 μm; endosome 4-5 μm (Illustrated Guide, 1985).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.1, Yokotashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, October 6, 2007 by Y. Tsukii