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
Class:	Reptilia
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]

See also

• Timeline of ceratopsian research

References

1. 1 2 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. 1 2 3 4 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.  CS1 maint: Uses authors parameter (link)
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.  CS1 maint: Uses authors parameter (link)

Marginocephalia
Kingdom: Animalia Phylum: Chordata Clade: Dinosauria Order: Ornithischia
Pachycephalosauria Basal Pachycephalosaurs Wannanosaurus Pachycephalosauridae Stegoceras-line Stegoceras Hanssuesia Gravitholus Colepiocephale Texacephale Pachycephalosaurus-line Homalocephale Prenocephale Goyocephale Sphaerotholus Tylocephale Acrotholus Amtocephale Pachycephalosaurini Pachycephalosaurus Dracorex Stygimoloch Alaskacephale
Ceratopsia Basal Ceratopsians Yinlong Stenopelix Micropachycephalosaurus Albalophosaurus Chaoyangsauridae Chaoyangsaurus Xuanhuaceratops Psittacosauridae Psittacosaurus Neoceratopsia Mosaiceratops Microceratus Aquilops Liaoceratops Koreaceratops Auroraceratops Archaeoceratopsidae Archaeoceratops Yamaceratops Helioceratops Coronosauria Graciliceratops Leptoceratopsidae Leptoceratops Montanoceratops Prenoceratops Udanoceratops Zhuchengceratops Gryphoceratops Unescoceratops Cerasinops Asiaceratops Bainoceratops Bagaceratopidae Ajkaceratops Gobiceratops Bagaceratops Platyceratops Protoceratopsidae Protoceratops Breviceratops Lamaceratops Magnirostris Ceratopsoidea Zuniceratops Turanoceratops Ceratopsidae
Ceratopsidae Ceratopsinae Ceratops Centrosaurinae Albertaceratops Diabloceratops Machairoceratops Monoclonius Nasutoceratopsini Avaceratops Nasutoceratops Centrosaurini Centrosaurus Coronosaurus Rubeosaurus Spinops Styracosaurus Pachyrhinosaurini Achelousaurus Einiosaurus Pachyrhinosaurus Sinoceratops Xenoceratops Wendiceratops Chasmosaurinae Agujaceratops Anchiceratops Arrhinoceratops Bravoceratops Chasmosaurus Coahuilaceratops Judiceratops Kosmoceratops Medusaceratops Mercuriceratops Mojoceratops Pentaceratops Spiclypeus Utahceratops Vagaceratops Triceratopsini Eotriceratops Ojoceratops Polyonax Regaliceratops Tatankaceratops Titanoceratops Torosaurus Triceratops
Related Categories Ornithischians Ceratopsians Pachycephalosaurs