Family: Test round, thick, firm, with rod-like radial structure (Illustrated Guide, 1985).
Genus: Test consisting of a thin, flexible, homogeneous envelope, colorless or translucent, without adherent paticles; pseudostome terminal, elastic; cytoplasm colorless, granular, completely filling the test; nucleus large, placed posteriorly; pseudopodia numerous, long, branching but not anastomosing (Cash & Wailes, 1915). Pseudostome oval, cells clustered (Illustrated Guide, 1985).
Images of collecting locality:
No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii