Centrosaurinae

Eumetazoa

Centrosaurines Temporal range: Late Cretaceous, 77–69 Ma PreЄ Є O S D C P T J K Pg N
Various species of centrosaurines
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ceratopsia
Family:	†Ceratopsidae
Subfamily:	†Centrosaurinae Lambe, 1915
Type species
Centrosaurus apertus Lambe, 1904
Subgroups
†Albertaceratops †Avaceratops †Brachyceratops †Centrosaurus †Diabloceratops †Monoclonius †Pachyrhinosaurini †Sinoceratops †Styracosaurus
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 2011 phylogenetic analysis by Fiorillo and Tykoski.^[2]

Centrosaurinae	Diabloceratops eatoni Albertaceratops nesmoi "Centrosaurus" brinkmani Centrosaurus apertus Styracosaurus albertensis Pachyrhinosaurini Rubeosaurus ovatus Einiosaurus procurvicornis Pachyrostra Achelousaurus horneri Unnamed species (TMP 2002.72.1) Pachyrhinosaurus lakustai Pachyrhinosaurus canadensis Pachyrhinosaurus perotorum

Reproduction

Possible neonate sized centrosaurine fossils have been documented in the scientific literature.^[3] Research indicates that centrosaurines did not achieve adult morphology with its accompanying mating signals until nearly fully grown.^[4] Relative age of the animals was determined based on the size, degree of coossification, secondary ossification, and growth related changes in bone texture.^[4] 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.^[4] 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.^[5] Females, by contrast due not have such an extended adolescence.^[5]

Footnotes

1. ^ Sampson (1995).
2. ^ 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
3. ^ "Abstract," Tanke and Brett-Surman (2001). Page 207.
4. ^ ^{a b c} "Retarded Growth of Mating Signals," Sampson (2001); page 270.
5. ^ ^{a b} "Sociological Correlates in Extant Vertebrates," Sampson (2001); page 265.

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