Genus: Test chitinous, coloured greyish-rose or deep purple, nearly allways rough with adhering sand-grains; pseudostome narrow, elliptic, notched in lateral view, frontal view of pseudostome more or less convex or truncated, with rounded corners; (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909). Species: Test transparent, oval in broad view, 50-75 μm long, 25-30 μm wide; pseudostome distinctly convex (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.1, Oh-numa marsh, Akita-Hachimantai, Kazuno city, Akita Pref., Japan, September 21, 2007 by Y. Tsukii