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An Immature Pachyrhinosaurus perotorum (Dinosauria: Ceratopsidae) Nasal Reveals Unexpected Complexity of Craniofacial Ontogeny and Integument in Pachyrhinosaurus

Table 1

Ontogenetic stages of nasal boss development in Pachyrhinosaurus (Stage 1 youngest), based upon descriptions and inferences of Currie et al. [4].

Table 1