Procerosaurus

Procerosaurus is the name given to an invalid genus of dinosaur.

There are two Procerosaurus specimens:
 * The first was described as P. cruralis by von Huene in 1902 and is a junior synonym of Tanystropheus, a non-dinosaurian prehistoric reptile.
 * The second was described by Antonin Fritsch in 1878 as a species of Iguanodon (Iguanodon exogirarum, later amended to exogyrarum), and is a highly doubtful dinosaurian-like bit of bone (possibly an internal cast of a tibia) from the Cenomanian (Late Cretaceous) of the Czech Republic. He reassigned the species to Procerosaurus in 1905, unaware that the genus name was already in use. George Olshevsky in 2000 substituted Ponerosteus for this species.