Reptilia - Ornithischia - Ceratopsidae
Full reference: A. R. Fiorillo and R. S. Tykoski. 2012. A new Maastrichtian species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope of Alaska. Acta Palaeontologica Polonica 57(3):561-573
Parent taxon: Centrosaurinae according to M. J. Ryan et al. 2017
See also Fiorillo and Tykoski 2012
Sister taxa: Albertaceratops, Brachyceratops, Centrosaurini, Diabloceratops, Machairoceratops, Menefeeceratops, Monoclonius, Nasutoceratopsini, Sinoceratops, Stellasaurus, Wendiceratops, Xenoceratops
Subtaxa: Achelousaurus Einiosaurus Pachyrhinosaurus Pachyrostra
Ecology: ground dwelling herbivore
Distribution:
• Cretaceous of Canada (14: Alberta, Northwest Territories collections), United States (7: Alaska, Montana)
Total: 21 collections each including a single occurrence