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Pachyrhinosaurus is a genus of Centrosaurine Ceratopsian that lived in North America during the Late Cretaceous

Description
Pachyrhinosaurus can be distingushed from other Non-Pachyrostran Centrosaurs by the presence of a nasal boss instead of a nasal horn. Further, it can be distinguished from Achelousaurus by the more medially projected, curved P3 epiparietals, more pronounced P1 epiparietals, a shorter, rounder frill, among other features.

P. canadensis is known from the Horsehoe Canyon Formation and the Laterally equivalent St. Mary River Formation. It was estimated by Gregory S. Paul to be 5 meters long, 2 meters tall, and weigh 2 metric tones.

Species

 * P. canadensis (Sternberg, 1950)
 * P. lakustai (Currie, Langston & Tanke, 2008)
 * P. perotorum (Fiorillo & Tykoski, 2012)
 * P. "youngi" (Kruk, 2015, Thesis)
 * P. sp. nov.? TMP 2002.76.1

Phylogeny
This cladogram was recovered by Kruk (2015) in her thesis on P. "youngi".