Genus: Test round or oval in cross-section; pseudostome anteroventral; scales in regular rows (Illustrated Guide, 1985).

Trinema sp. 2 clips μm Higashi-hiroshima Hiroshima, 1998

Trinema sp. 2 clips Higashi-hiroshima Hiroshima, 1998

Trinema sp. 4 clips Namegawa Saitama, 1999