Diagnosis– (Translation from the original German; after Hillmer & Schulz, 1973, p.10) “Long, blindly ending, slightly curved, tubular boring. Cross-section of the distal end is weakly dumb-bell to oval-shaped. At the proximal end of the trace four parallel rows of dimple-shaped chambers may occur.”

Description– Borings Y-shaped with circular apertural openings. The diameter of each aperture on individual specimens is constant. For the figured specimen the diameter is c. 110 μm. The borings are perpendicular to the substrate surface.