Named By: C. M. Sternberg - 1937.
Synonyms: Thescelosaurus warreni.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda.
Species: P. warreni (type).
Size: About 2.5 meters long.
Known locations: Canada, Alberta - Horseshoe Cnayon Formation.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Skull and partial post cranial fossils.
was first described by William Parks as a species of Thescelosaurus
1926, but in 1937 Charles M. Sternberg reclassified it as a
distinct genus. Sternberg chose the name Parksosaurus
Park’s lizard in recognition of the initial work done by William
Parks. Parksosaurus and Thescelosaurus
together are proof that even
in the latest Cretaceous there was still an ecological niche for small
and swift herbivorous dinosaurs that had still not been filled by
two of the most common herbivorous
dinosaurs at this time.
Parksosaurus is usually treated as a hypsilophodont dinosaur (relative of Hypsilophodon), and as with others of its kind, swift speed and agility were key to the survival of the individual. With this in mind, the larger dinosaurian predators of the time such as large tyrannosaurs like adult Albertosaurus and Tyrannosaurus probably did not even bother with smaller dinosaurs like Parksosaurus. However, troodonts, such as the Troodon genus itself would themselves have been swift and deadly, and certainly capable of taking down a Parksosaurus, especially from an ambush.
- Classification of Thescelosaurus, with a description of a new species. - Proceedings of the Geological Society of America 1936:375. - C. M. Sternberg - 1937.
- Redescription of the skull and mandible of Parksosaurus from the Late Cretaceous with comments on the family Hypsilophodontidae (Ornithischia). - Life Sciences Contribution, Royal Ontario Museum 89: 1–21. - Peter M. Galton - 1973.