Genus: Pseudostome lacks lobed collar; test round or oval in cross-section;
pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: Test pyriform, flask-shaped, or ovoid; neck variable in length; aperture terminal, typically circular; test composed of angular sand-grains, diatoms; 60-580 μm by 40-240 μm (Kudo, 1966). |
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Kamino-tanbo (bog/marsh), Tsugaike highland (near Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
