Length, 5 mm; diameter, 1 mm. Shell: cylindrical, apex tapering; with three granular spirals on the last whorl; dark brown, apex white. Spire: protoconch not known; teleoconch of about 10 straight-sided whorls; suture distinct, oblique. Sculpture: last whorl with three rows of rounded granules, other whorls with two and a median thread; granules small, rounded, and very close set. Aperture: ovate; outer lip not enclosing the anterior canal which is short, recurved; posterior sinus a deep, narrow slit. Color: dark brown, apex white.
These triphorids have been collected at depths of 50 to 60 m.
T. truncis was described from the Capricorn Group, off Cairns, and from Low Isles on the Great Barrier Reef, Australia.