Xylonichnus Genise, 1995

Amended diagnosis: Longitudinal, tangential and radial borings interconnected into the boxwork in different depths in the xylem. Cross‐section is flat‐oval, rectangular to circular. The infill of frass or faecal pellets may be developed (after Genise, 1995; Genise and Hazeldine, 1995).

Macroboring; substrate xylic; tracemaker invertebrate

Diagnosis: Longitudinal borings at different depths inthe xylem, interconnected by tangential tunnels. Crosssections of borings are rectangular; with rounded cornersand extremely flat; the height approximately one-fourththe width. Borings have an outer layer and are filled withfrass that is mostly separated in packages, or has meniscusstructure. Borings are in permineralized wood of a con-ifer, which exhibits well-preserved cellular structure.

Category of architectural design: 2.60. Borings with elliptical to sub-rectangular cross sections.

Unbranched, elliptical.