Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966). Species: Test 120-150 x 75-100 μm, 60-75 μm in hight, pouch-shaped in oral view, round in lateral, tapered toward anterior; pseudostome 25-30 μm with incurved lips; several similar species (Illustrated Guide, 1985).

50 μm 100 μm 150 μm; x 400

Images of collecting locality: No. 7, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii