Pachyrhinosaurini

Pachyrhinosaurins Temporal range: Late Cretaceous, 84.9–69 Ma PreЄ Є O S D C P T J K Pg N
Skull of a Pachyrhinosaurus canadensis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Family:	†Ceratopsidae
Subfamily:	†Centrosaurinae
Tribe:	†Pachyrhinosaurini Fiorillo & Tykoski, 2012
Type species
Pachyrhinosaurus canadensis Sternberg, 1950
Subdivisions[1]
†Xenoceratops †Wendiceratops †Sinoceratops †Einiosaurus †Rubeosaurus[2][3] †Pachyrostra

Pachyrhinosaurini was a subfamily of centrosaurine dinosaurs. The clade existed during the Late Cretaceous, about 84.9 to 66 million years ago, evolving during the earliest Campanian,^[4] and becoming extinct in the Maastrichtian.^[3][5]

Classification

Pachyrhinosaurini was defined in 2012 by Fiorillo & Tykoski. It was defined as all centrosaurine ceratopsids more closely related to Pachyrhinosaurus canadensis than to Centrosaurus apertus. It was defined during the description of Pachyrhinosaurus petorum, a species from Alaska^[3]

Below is a cladogram by Sampson et al. 2013,^[1] with clade names such a Pachyrhinosaurini as defined by Fiorillo and Tykoski (2012).^[3]

	Leptoceratops Protoceratops Magnirostris Bagaceratops Ceratopsoidea Turanoceratops Zuniceratops Ceratopsidae Chasmosaurinae Chasmosaurus Pentaceratops Centrosaurinae Diabloceratops Avaceratops Nasutoceratops Albertaceratops Rubeosaurus Styracosaurus Spinops Centrosaurus Coronosaurus Pachyrhinosaurini Xenoceratops Sinoceratops Wendiceratops Einiosaurus Pachyrostra Achelousaurus Pachyrhinosaurus

See also

• Timeline of ceratopsian research

References

1. Sampson, S.D.; Lund, E.K.; Loewen, M.A.; Farke, A.A.; Clayton, K.E. (2013). "A remarkable short-snouted horned dinosaur from the Late Cretaceous (late Campanian) of southern Laramidia". Proceedings of the Royal Society B. 1766 280: 4. doi:10.1098/rspb.2013.1186.
2. Ryan, M.J.; Evans, D.C.; Shepherd, K.M.; Sues, H. (2012). "A new ceratopsid from the Foremost Formation (middle Campanian) of Alberta". Canadian Journal of Earth Sciences 49 (10): 1251. doi:10.1139/e2012-056.
3. Fiorillo, A.R. & Tykoski, R.S. (2012). "A new Maastrichtian species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope of Alaska". Acta Palaeontologica Polonica 57 (3): 561. doi:10.4202/app.2011.0033.
4. Gilmore, C.W. (1930). "On dinosaurian reptiles from the Two Medicine Formation of Montana". Proceedings of the United States National Museum 77 (16): 1–39. doi:10.5479/si.00963801.77-2839.1.
5. Fiorillo, A.R. & Gangloff, R.A. (2001). "Theropod teeth from the Prince Creek Formation (Cretaceous) of northern Alaska, with speculations on Arctic dinosaur paleoecology". Journal of Vertebrate Paleontology 20 (4): 675–682. doi:10.1671/0272-4634(2000)020[0675:TTFTPC]2.0.CO;2.