Diagnosis: -Grazing traces, rathe meandriform, shallow grooves aranged in parallel groups that intersect, or rotating around the one point on the surface (jJght, 2003)

Unbranched, groove.

Category of architectural design: 2.79. Groove bioerosion traces.

Diagnosis (original): Minute patches or shallow grooves with parallel or subparallel striae arranged side by side in transverse rows or irregularly distributed.

Diagnosis (redefined): Parallel to subparallel furrows produced on hard substrates, arranged in meandering patches, grooves, or lines.

Comments: Radulichnus is a substrate-controlled trace fossil found on both inorganic (i.e. rocks) and organic (i.e. shells, bones) material that is hard enough to enable the settlement and growth of epilithic organisms grazing on it. It differs from scratch traces classified as Kimberichnus Ivantsov, 2013 by its smaller size and their association with hardgrounds rather than softgrounds covered by microbial mats (Knaust 2015b).