Genus: Test more or less compressed; pseudostome elliptical on end of a clear collar
(Illustrated Guide, 1985).
Species: Test ovoid, formed of 4 tarnsverse rows of oval scales; 28-45 μm long, 20-30 μm wide; pseudostome 8-16 μm; nucleus spherical 10-12 μm in diam. (Cash, 1915).
Images of collecting locality:
No.2, Maimeno-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii