What is the anatomical name of this design choice to have spikes

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What is the anatomical name of this design choice to have spikes on the back in paleoart? Which dinosaurs do we know had these and how do we know? : r/Dinosaurs

Is there any known ceratopsian with only one horn? : r/Paleontology

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What is the anatomical name of this design choice to have spikes on the back in paleoart? Which dinosaurs do we know had these and how do we know? : r/Dinosaurs

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Is there any known ceratopsian with only one horn? : r/Paleontology

Could carcharodontosaurids have feathers like tyrannosaurids? : r/Dinosaurs

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