Nihilichnus sulcatus Trifilio, de Araújo Júnior et Porpino, 2023

Diagnosis:Ellipsoidal  holes  with  branching  furrows.  Both  holes  and  furrows  penetrate  through  the  cortical  bone  into  the  cancellous  bone,  but  neither  contains  filling  or  bioglyphs.  The  holes  are  perpendicular  to  the  bone  surface  and  have  sharp  edges,  whereas  the  furrows  have  a  smooth  bottom,  U-shaped  cross-sectional  mor-phology,  and  smooth  edges.