Ponerosteus
Ponerosteus is a dubious genus of archosauromorph which was first identified as "Iguanodon exogirarum" by Antonín Frič in 1878 for a specimen from the Cenomanian. He later renamed it Procerosaurus, unaware that this name was already in use. It was renamed Ponerosteus exogyrarum by George Olshevsky in 2000; however, the taxon is considered a nomen dubium by most, as the type material is extremely poor, being apparently an internal cast of a tibia from an animal that may or may not be a dinosaur. The name Ponerosteus can be translated as "bad", "worthless", or "useless bone", which accurately describes the nature of the material.
