Genus: Test round or oval in cross-section; pseudostome anteroventral;
scales in regular rows (Illustrated Guide, 1985).
Species:
Trinema sp. (T. lineare Penard or similar species ?),
test 45 μm long, 18 μm wide, pseudostome 10 μm wide,
large scales circular, 6 μm in diam.,
x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii 50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Similar genus Corythion: Test round or oval in cross-section;
pseudostome anteroventral; scales irregularly scattered;
rim of pseudostome incurved (Illustrated Guide, 1985).