Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome at end of bent neck; test more or less coiled or folded (Illustrated Guide, 1985). Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: a wetland at Ichinose-enchi, Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii