Genus: Test ovate, discoid in cross-section; pseudostome a terminal slit
(Illustrated Guide, 1985).
Species: Test chitinous, transparent, yellowish; frontal view oblong-oval or pyriform, 110-140 μm long; a minute pore present on each side at the broadest point; lateral view elongate-pyriform; pseudostome forming a shallow notch; transverse section narrowly elliptic; (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Images of collecting locality:
a small marsh near prefectural road route 342, Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, June 24, 2007 by Y. Tsukii