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PACHYRHINOSAURUS

a plant-eating centrosaurine ceratopsid dinosaur from the Late Cretaceous of Canada.
Pachyrhinosaurus canadensis
Pronunciation: pak-ee-RI-no-SOR-us
Meaning: Thick-nosed lizard
Author/s: C.M. Sternberg (1950)
Synonyms: None known
First Discovery: Alberta, Canada
Chart Position: 148

Pachyrhinosaurus canadensis

Etymology
Pachyrhinosaurus is derived from the Greek "pakhys" (thick), "rhin" (nose) and "sauros" (lizard") because of a thick bony nasal "boss" where most large ceratopsians have a horn. Some researchers think that this boss was merely a platform to support a huge boneless horn made of keratine - a naturally occuring protein that is a major component of things like fingernails, hooves, claw and horn coverings, and hair. Unfortunately it doesn't fossilize so evidence is sadly lacking.
The species epithet, canadensis, is derived from "Canada" (its place of discovery) and the Latin "ensis" (from).
Discovery
The first Pachyrhinosaurus fossils were discovered at Little Bow River in the St. Mary River Formation, Alberta, Canada, by Charles M. Sternberg in 1946. The holotype (NMC 8867) is a skull.
Remains of Pachyrhinosaurus canadensis have also been discovered at the unfortunately named Scabby Butte locality of Alberta's lower Horseshoe Canyon Formation. And a particularly handsome skull (NMC 9485) was found by Wann Langston in 1967 at Munson Ferry near Drumheller.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian-Maastrichtian
Age range: 80-67 mya
Stats:
Est. max. length: 8 meters
Est. max. hip height: ?
Est. max. weight: 3 tons
Diet: Herbivore
Family Tree:
Dinosauria
Ornithischia
Cerapoda
Marginocephalia
Ceratopsia
Centrosaurinae
Pachyrhinosaurus
canadensis
Other Species
pachyrhinosaurus perotorum boss Pachyrhinosaurus perotorum (DMNH21200—a partial skull), long known simply as "the Perot Dinosaur", was recovered from Kikak-Tegoseak Quarry in Alaska's Prince Creek Formation (70-69 mya), in 2006. As in Pachyrhinosaurus canadensis, the bosses over its nose and eyes nearly grew together, separated only by a narrow groove, but its frill lacked the two small, hook-like horns. It was named in 2011, and a juvenile specimen was discovered just over a year after that, loitering in blocks that had been removed from the same quarry at the same time, which allowed paleontologists to plot the growth pattern of its facial lumps. The epithet, perotorum, is named for Margot and Ross Perot and their children.
Pachyrhinosaurus lakustai (TMP 1986.55.258)is named for Al Lakusta who discovered its first remains along Pipestone Creek, (Wapiti Formation), Alberta, in 1972. When workers from the Royal Tyrrell Museum finally excavated the site between 1986-1989 they discovered thousands of bones and 14 skulls from juvenile to geriatric specimens. Unlike Pachyrhinosaurus canadensis and Pachyrhinosaurus perotorum whose bosses virtually merge into one, those of Pachyrhinosaurus lakustai are separated by a wide gap. Some specimens sport two small frill horns present in Pachyrhinosaurus canadensis, though some don't which suggests their presence depended on age or gender.
Pachyrhinosaurus lakustai is the oldest species of Pachyrhinosaurus (84 to 71 Mya) so could well be the direct ancestor of the other two.
References
• C. M. Sternberg (1947) "New dinosaur from southern Alberta, representing a new family of the Ceratopsia". Geological Society America Bulletin 58:1230.
• W. Langston (1967) "The thick-headed ceratopsian dinosaur Pachyrhinosaurus (Reptilia: Ornithischia), from the Edmonton Formation near Drumheller, Canada". Canadian Journal of Earth Sciences 4:171-186.
• P.J. Currie, W. Langston and D.H. Tanke (2008) "A new species of Pachyrhinosaurus from the Upper Cretaceous of Alberta, Canada" in "A New Horned Dinosaur from an Upper Cretaceous Bone Bed in Alberta". /uk
• A.R. Fiorillo and R.S.T. Tykoski (2011) "A new species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope (Prince Creek Formation: Maastrichtian) of Alaska".
• Fiorillo AR, Tykoski RS (2013) "An Immature Pachyrhinosaurus perotorum (Dinosauria: Ceratopsidae) Nasal Reveals Unexpected Complexity of Craniofacial Ontogeny and Integument in Pachyrhinosaurus". PLoS ONE 8(6): e65802.
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To cite this page:
Atkinson, L. "PACHYRHINOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 26th Mar 2017.
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