| Centrosaurines Temporal range: Late Cretaceous, 77–69 Ma |
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| 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 |
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| Subgroups | |
| Synonyms | |
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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]
Contents |
The cladogram presented here follows a 2011 phylogenetic analysis by Fiorillo and Tykoski.[2]
| Centrosaurinae |
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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]