Pachyrhinosaurus was a large, plant-eating dinosaur that had a bony, spiked neck frill, four short legs, and a short tail. Pachyrhinosaurus was a short-frilled ceratopsian dinosaur that was 18 to 23 feet (5.5 to 7 m) long. Pachyrhinosaurus had many small horns on the middle of its frill.
| Pachyrhinosaurus Temporal range: | |
|---|---|
 | |
| P. perotorum mounted at the Perot Museum | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Family: | †Ceratopsidae |
| Subfamily: | †Centrosaurinae |
| Clade: | †Pachyrostra |
| Genus: | †Pachyrhinosaurus Sternberg, 1950 |
| Type species | |
| †Pachyrhinosaurus canadensis Sternberg, 1950 | |
| Species | |
| |
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