Genus: Test ovoid, symmetrical, compressed, composed of a transparent membrane with or without adherent extraneous particles
(Cash & Wailes, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).
Species: Test covered with many grains of quartz and various extraneous particles, 55-97 μm long, 31-74 μm wide; pseudostome lacking any collar, cytoplasm containing algal endosymbionts (Cash & Wailes, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).
Images of collecting locality:
No.4, Yahei-daira-shitsugen (Yahei-daira marsh), North of Higashidaiten, Azuma mountains, Yonezawa city, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii