Neck frill

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Neck frill is the popular term for a bony margin seen on the back of skulls of dinosaurs of the suborder Marginocephalia. In technical terms, this frill is composed of an enlarged parietal flanked by elongate squamosals, and sometimes ringed by epoccipitals, bony knobs that gave the margin a jagged appearance. In some genera, such as Triceratops, Pentaceratops, and Torosaurus, this extension is very large.