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A new centrosaurine ceratopsid from the Oldman Formation of Alberta and its implications for centrosaurine taxonomy and systematics

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Centrosaurus brinkmani (sp. nov) is distinguished from Centrosaurus apertus by key features of its cranial ornamentation, including the shape and orientation of the postorbital horn and parietal ornamentation at parietal locus 3, the shape of the parietal ornamentation at locus 2, and the possession of accessory parietal ossifications developed as short spines on the caudal parietal ramus. This species is restricted to the Oldman Formation of southern Alberta and is the oldest ceratopsid represented by diagnostic material in Canada. Phylogenetic analysis of the Centrosaurinae suggests that the development of spike-like ornamentation at the parietal locus 3 parietal locus is inversely related to the development of the P1 parietal ornamentation.

Centrosaurus brinkmani (sp. nov) se distingue de Centrosaurus apertus par d'importants caractères de son ornementation crânienne dont la forme et l'orientation de la corne post-orbitale et de l'ornementation pariétale au locus pariétal no 3, la forme de l'ornementation pariétale au locus no 2 et la présence d'ossifications pariétales accessoires formant de courtes épines sur la rame caudale pariétale. La présence de cette espèce se limite à la Formation d'Oldman du sud de l'Alberta et il s'agit du plus ancien Cératopsidé représenté par du matériel diagnostique au Canada. L'analyse phylogénique des Centrosaurinés indique qu'il existe une relation inverse entre le développement de l'ornementation en forme de pointe au locus pariétal no 3 et le développement de l'ornementation au locus pariétal no 1.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2005

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