Genus (Dujardin, 1841): Test round or oval in cross-section; pseudostome anteroventral;
scales in regular rows (Illustrated Guide, 1985).
Species:
Trinema sp. ?,
test 130 μm long, 90 μm wide, pseudostome 37 μm wide,
large scales nearly circular in shape (13-15 μm in diam.), each surrounded by small scales,
x 400, x 640, 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