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: 120-150 μm long, 100-140 μm wide; test with constriction at base of neck; pseudostome round, 28-35 μm long (Illustrated Guide, 1985).

31 μm 63 μm 94 μm; x 640

Lesquereusia gibbosa Thomas & Gauthier-Liévre, test 145 μm long, 130 μm wide, L/W=, pseudostome 38 μm wide, x 640, Mumei marsh (a marsh without name), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Images of collecting locality: Mumei marsh (a marsh without name), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii