Centrosaurine

Centrosaurines
Temporal range: Late Cretaceous, 77–69Ma
Various species of centrosaurines
Type species
Centrosaurus apertus
Lambe, 1904
Synonyms
  • Pachyrhinosaurinae Sternberg, 1950

The Centrosaurinae is a subfamily of ceratopsid dinosaurs named by paleontologist Lawrence Lambe, in 1915, with Centrosaurus as the type genus. The centrosaurines are further divided into two tribes, the centrosaurins and the pachyrhinosaurins.[1]

Classification

The cladogram presented here follows a 2012 phylogenetic analysis by Ryan, Evans & Shepherd.[2] Clade names within Centrosaurinae follow Fiorillo & Tykoski (2011).[3]

Ceratopsidae 

Chasmosaurinae


 Centrosaurinae 

Xenoceratops foremostensis




Diabloceratops eatoni




Avaceratops lammersi




Albertaceratops nesmoi





Spinops sternbergorum




Centrosaurus apertus




Coronosaurus brinkmani



Styracosaurus albertensis





Pachyrhinosaurini

Sinoceratops zhuchengensis




Rubeosaurus ovatus




Einiosaurus procurvicornis


 Pachyrostra 

Achelousaurus horneri




Pachyrhinosaurus canadensis



Pachyrhinosaurus lakustai













This cladogram follows the phylogenetic analysis performed by Sampson et al. (2013). As is the case above, clade names within Centrosaurinae follow Fiorillo & Tykoski (2011).[3]

Ceratopsidae 

Chasmosaurinae


 Centrosaurinae 

Diabloceratops eatoni





Avaceratops lammersi



Nasutoceratops titusi





Albertaceratops nesmoi






Rubeosaurus ovatus



Styracosaurus albertensis





Spinops sternbergorum




Centrosaurus apertus



Coronosaurus brinkmani





Pachyrhinosaurini


Xenoceratops foremostensis



Sinoceratops zhuchengensis





Einiosaurus procurvicornis


 Pachyrostra 

Achelousaurus horneri




Pachyrhinosaurus canadensis




Pachyrhinosaurus lakustai



Pachyrhinosaurus perotorum












Reproduction

Possible neonate sized centrosaurine fossils have been documented in the scientific literature.[4] Research indicates that centrosaurines did not achieve adult morphology with its accompanying mating signals until nearly fully grown.[5] Relative age of the animals was determined based on the size, degree of coossification, secondary ossification, and growth related changes in bone texture.[5] Sampson finds commonality between the retarded growth of mating signals in centrosaurines and the extended adolescence of animals whose social structures are ranked hierarchies founded on age-related differences.[5] In these sorts of groups young males are typically sexually mature for several years before actually beginning to breed, when their mating signals are most fully developed.[6] Females, by contrast, do not have such an extended adolescence.[6]

Footnotes

References

  • Sampson, S. D. (1995b). "Two new horned dinosaurs from the Upper Cretaceous Two Medicine Formation of Montana; with a phylogenetic analysis of the Centrosaurinae (Ornithischia: Ceratopsidae)." Journal of Vertebrate Paleontology, 15(4): 743-760.
  • Sampson, S. D., 2001, Speculations on the socioecology of Ceratopsid dinosaurs (Orinthischia: Neoceratopsia): In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 263–276.
  • Tanke, D.H. and Brett-Surman, M.K. 2001. Evidence of Hatchling and Nestling-Size Hadrosaurs (Reptilia:Ornithischia) from Dinosaur Provincial Park (Dinosaur Park Formation: Campanian), Alberta, Canada. pp. 206–218. In: Mesozoic Vertebrate Life—New Research Inspired by the Paleontology of Philip J. Currie. Edited by D.H. Tanke and K. Carpenter. Indiana University Press: Bloomington. xviii + 577 pp.

External links

Dinosaurs portal
  • Centrosaurinae
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