 In "Triarthrus eatoni" the antennas are probably flexible.From their attachment adjacent to the hypostome they stretch inward and forward, almost touching each other at the point where, from a dorsal viewpoint, they appear from under the cephalic margin, then bending outward and then forward again in a slight S-curve.They are about twice as long as the headshield (or cephalon), each consisting of 40 to 50 segments that are shorter than wide.