Nihilichnus Mikuláš, Kadlecová, Fejfar et Dvořák, 2006

Emended diagnosis: Roughly triangular, circular, elliptical, or lenticular holes, or external pits, found on skeletal material, occurring solitarily or in groups, which may show recurring patterns. Outer margin of the concavity is either smooth and continuous with surrounding skeletal material or shows minute irregular jags. Lacks organized boring patterns.

Revised diagnosis: Roughly triangular to ellipsoidal holes that lack bioglyphs and filling. Their perforation axis may be perpendicular 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.