DescriptionCentrosaurus parietal hook by Nick Longrich.jpg
English: Hooked hornlet from the back of the frill (parietal bone) of Centrosaurus apertus (Dinosauria: Ornithischia: Ceratopsia: Ceratopsidae: Centrosaurinae) from the Late Cretaceous (Campanian) Dinosaur Park Formation, Dinosaur Provincial Park, Alberta, Canada. Specimen discovered by Nick Longrich; Photo by Nick Longrich.
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