Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large,
with or lacking a collar (Illustrated Guide, 1985).
Difflugia claviformis Ehrenberg,
test 275 μm long (including spiny projection about 35 μm long),
75 μm wide, L/W=3.7, pseudostome 50 μm wide,
x 200, x 400, x 640, No.2, Lake Nakatsuna, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii
150 μm; x 400 ;
94 μm; x 640
Images of collecting locality:
No.2, Lake Nakatsuna, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii
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