Xylonichnus Genise, 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.