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Temporal range: Late Cretaceous
Burpee - Thescelosaurus.JPG
Thescelosaurus at the Burpee Museum of Natural History in Rockford, Illinois
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
Infraorder: Ornithopoda
Family: Hypsilophodontidae
Subfamily: Thescelosaurinae
Genus: Thescelosaurus
Gilmore, 1913
  • T. neglectus Gilmore, 1913 (type)
  • T. garbanii Morris, 1976

Thescelosaurus was a plant-eating dinosaur that lived in forests during the late Cretaceous period in North America, about 77 to 65 million years ago. A Thescelosaurus fossilized four-chambered heart was recently found near Buffalo, South Dakota in USA.

One complete specimen and 8 incomplete Thescelosaurus skeletons, including skin impressions, have been found in Wyoming, Montana, and South Dakota in the USA and in Alberta and Saskatchewan in Canada.