Nihilichnus Mikulás, Kadlecová, Fejfar et Dvořák, 2006

Revised  diagnosis: Roughly  triangular  to  ellipsoidal  holes  that  lack  bio-glyphs  and  filling.  Their  perforation  axis  may  be  per-pendicular  or  oblique  to  the  surface  of  the  bone.  Individually  or  in  groups,  the  holes  reach  the  cortical  and  cancellous  bone.  Their  borders  can  be  soft  or  irregular,  and  the  outer  part  of  the  margin  of  the  cavity  shows  minute,  irregular  jags  caused  by  a  brittle  deformation.

Predation; substrate osteic; tracemaker vertebrate

Diagnosis: Roughly triangular, circular or ovoid holes or external pits, occurring solitarily or in groups, which may show recurring patterns. Outer part of the margin of the cavity shows minute, irregular jags, resulting from a brittle deformation.