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Arrhinoceratops brachyops. See more dinosaur images.

Brian Franczak

ARRHINOCERATOPS (ar-RINE-oh-SAIR-ah-tops)

Period: Late Cretaceous

Order, Suborder, Family: Ornithischia, Marginocephalia, Ceratopsidae

Location: North America (Canada)

Length: 20 feet (6 meters)

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Arrhinoceratops is a rare ceratopsian known from only one skull that lacks a lower jaw. This single specimen was found in 1923 along the Red Deer River of Alberta by an expedition from the University of Toronto. William A. Parks named this dinosaur Arrhinoceratops brachyops, meaning "no nose-horn face," in 1925. This name is incorrect; Arrhinoceratops did have a short, blunt nasal horn.

Arrhinoceratops brachyops skull

Royal Ontario Museum

Arrhinoceratops had a short, deep, wide face with large nostrils. Its two brow horns were moderately long, very pointed, and curved forward. The neck frill was broad with small, oval fenestrae (openings), and was rounded. Much of the skull of Arrhinoceratops was slightly crushed and distorted, making it difficult to understand the pattern of the skull bones. Paleontologists don't know what the rest of its body looked like.

Arrhinoceratops lived at the same time as its close relative Anchiceratops. It was also closely related to Torosaurus, Chasmosaurus, Pentaceratops, and Triceratops.