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Temporal range: Late Cretaceous, 66 Ma
Thespesius occidentalis.jpg
The syntype fossils
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Family: Hadrosauridae
Subfamily: Saurolophinae
Genus: Thespesius
Leidy, 1856
T. occidentalis
Binomial name
Thespesius occidentalis
Leidy, 1856

Thespesius, or Thespecius, is an extinct hadrosaur described by Joseph Leidy in 1876.

History of Thespesius[change | change source]

Thespecius was discovered in Montana in 1855. Known fossils include vertebrae and toe bones (phalanx).

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.