Pachyrhinosaurini

Pachyrhinosaurins
Temporal range: Late Cretaceous, 84.9–69 Ma
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]

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

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.
  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.
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