|The syntype fossils|
Thespesius, or Thespecius, is an extinct hadrosaur described by Joseph Leidy in 1876.
History of Thespesius[change | change source]
The name Thespesius means wondrous one. Leidy avoided using the suffix "saurus" in the genus name because Vandiveer Hayden had claimed the bones came from a layer from the Miocene so there was a chance that the animal would turn out to be a mammal, though Leidy himself was convinced it was a dinosaurian. Thespesius turned out to be a dinosaur. The specific name occidentalis means "western" in Latin.