Pachyrhinosaurus

Name: Pachyrhinosaurus ‭(‬Thick nosed lizard‭)‬. Phonetic: Pack-ee-rye-no-sore-us. Named By: Charles Mortram Sternberg‭ ‬-‭ ‬1950. Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ceratopsia,‭ ‬Ceratopsidae,‭ ‬Centrosaurinae,‭ ‬Pachyrostra. Species: P.‭ ‬canadensis‭ (‬type‭)‬,‭ ‬P.‭ ‬lakustai,‭ ‬P.‭ ‬perotorum. Diet: Herbivore. Size: 8‭ ‬meters long. Known locations: Canada,‭ ‬Alberta‭ ‬-‭ ‬Bearpaw Formation,‭ ‬Horseshoe Canyon Formation.‭ ‬USA,‭ ‬Alaska‭ ‬-‭ ‬Prince Creek Formation. Time period: Campanian of the Cretaceous. Fossil representation: Skulls of many individuals as well as hundreds of associated bones.

Even though it did not have the elaborate horns of some ceratopsians like  Einiosaurus ,‭ ‬Pachyrhinosaurus has become a favourite amongst ceratopsian dinosaur enthusiasts because of the large bony growth called a boss that is present on top of its snout.‭ ‬A second smaller boss was also present over the eyes and is sometimes close to the nasal boss.‭ ‬Pachyrhinosaurus still possessed some small horns,‭ ‬particularly around the edges of the frill.‭ ‬Some of these characteristics are shared amongst the Pachyrhinosaurus species while some are unique to just one species.