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: Test 100 μm long, 80 μm wide (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Images of collecting locality:
No. 5, Miyatoko marsh, Minami-Aizu town, Fukushima Pref., Japan, June 15, 2008 by Y. Tsukii