User:Montanoceratops/sandbox

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

Description
Pachyrhinosaurus can be distinguished 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 6 meters long, 2 meters tall, and weigh 3 metric tones.

P. lakustai is known from the Wapiti Formation. It was estimated by Gregory S. Paul to be 5m long, and weigh 2 metric tons.

P. perotorum is known from the Prince Creek Formation. It was estimated by Gregory S. Paul to be 5m long, and weigh 2 metric tons

P. "youngi" was found in the Wapiti Formation. Kruk didn't provide estimates on size of P. "youngi", however it can be assumed to be around 5-6m long and weighed 2-3 tons due to it's phylogenetic position.

TMP 2002.76.1 is known from the Dinosaur Park Formation.

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".