Genus: Test round or oval in cross-section; pseudostome anteroventral;
scales in regular rows (Illustrated Guide, 1985).
Species:
Trinema sp.,
test 31 μm long, 21 μm wide, L/W=,
pseudostome 7 x 8 μm wide,
x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640