[N] 2011 Pachyrhinosaurus perotorum
Fiorillo, A.R. and Tykoski, R.S.T. (in press). A new species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope (Prince Creek Formation: Maastrichtian) of Alaska. Acta Palaeontologica Polonica, available online 26 Aug 2011. doi:10.4202/app.2011.0033 [Pachyrhinosaurus perotorum]
Abstract: The Cretaceous rocks of the Prince Creek Formation contain the richest record of polar dinosaurs found anywhere in the world. Here we describe a new species of horned dinosaur, Pachyrhinosaurus perotorum that exhibits an apomorphic character in the frill, as well as a unique combination of other characters.
Phylogenetic analysis of 16 taxa of ceratopsians failed to resolve relationships between Pachyrhinosaurus perotorum and other Pachyrhinosaurus species (Pachyrhinosaurus canadensis and Pachyrhinosaurus lakustai). Pachyrhinosaurus perotorum shares characters with each of the previously known species that are not present in the other, including very large nasal and supraorbital bosses that are nearly in contact and separated only by a narrow groove as in Pachyrhinosaurus canadensis , and a rostral comb formed by the nasals and premaxillae as in Pachyrhinosaurus lakustai.
Pachyrhinosaurus perotorum is the youngest centrosaurine known (70-69 Ma), and the locality that produced the taxon, the Kikak-Tegoseak Quarry, is close to the highest latitude for recovery of ceratopsid remains.
Abstract: The Cretaceous rocks of the Prince Creek Formation contain the richest record of polar dinosaurs found anywhere in the world. Here we describe a new species of horned dinosaur, Pachyrhinosaurus perotorum that exhibits an apomorphic character in the frill, as well as a unique combination of other characters.
Phylogenetic analysis of 16 taxa of ceratopsians failed to resolve relationships between Pachyrhinosaurus perotorum and other Pachyrhinosaurus species (Pachyrhinosaurus canadensis and Pachyrhinosaurus lakustai). Pachyrhinosaurus perotorum shares characters with each of the previously known species that are not present in the other, including very large nasal and supraorbital bosses that are nearly in contact and separated only by a narrow groove as in Pachyrhinosaurus canadensis , and a rostral comb formed by the nasals and premaxillae as in Pachyrhinosaurus lakustai.
Pachyrhinosaurus perotorum is the youngest centrosaurine known (70-69 Ma), and the locality that produced the taxon, the Kikak-Tegoseak Quarry, is close to the highest latitude for recovery of ceratopsid remains.