Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Group [Vulgaroides]: Test hemispherical; height 1/2 ~ 4/5 diam.; lacks external shelf or rim.
Species: 70-120 μm diam., 50-75 μm high; test yellow, brwon to black with age; pseudostome round, invaginated; dorsal surface dimpled (Illustrated Guide, 1985).
Images of collecting locality:
No.1, Iyari marsh, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii