Petroxestes

Petroxestes is a shallow, elongate boring (a type of trace fossil) originally found excavated in carbonate skeletons and hardgrounds of the Upper Ordovician of North America. ^[2][3] These Ordovician borings were likely made by the mytilacean bivalve Corallidomus as it ground a shallow groove in the substrate to maintain its feeding position.^[4] They are thus the earliest known bivalve borings.^[5] Petroxestes was later described from the Lower Silurian of Anticosti Island (Canada).^[6] and the Miocene of the Caribbean.^[7]

Petroxestes
Petroxestes pera borings in an Upper Ordovician hardground (Waynesville Formation, southern Ohio).
Trace fossil classification
Ichnofamily:	†Rogerellidae
Ichnogenus:	†Petroxestes Wilson & Palmer, 1988
Type ichnospecies
Petroxestes pera Wilson & Palmer, 1988
Ichnospecies[1]
P. altera Jagt et al., 2009 P. pera Wilson & Palmer, 1988