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a herbivorous chasmosaurine ceratopsid (horn faced) dinosaur from the Late Cretaceous of Canada.
Pronunciation: KAS-mo-SOR-us
Meaning: Chasm lizard
Author/s: Lambe (1914)
Synonyms: Protorosaurus
First Discovery: Alberta, Canada
Chart Position: 82

Chasmosaurus belli

When Lawrence Lambe ran the rule over what would eventually become Chasmosaurus, he added it to the fossil register as Monoclonius belli; a second species of E.D. Cope's Monoclonius, but the discovery of similar yet more complete remains by Charles Hazelius Sternberg and sons during the early part of the 20th century convinced him that his new ceratopsian wasn't Monoclonius at all. In 1914, Lambe christened his new critter Protorosaurus, blissfully unaware that Christian von Meyer had already assigned that name to the earliest known archosauromorph (Protorosaurus speneri) some 84 years beforehand. So, he settled on Chasmosaurus belli—Bell's Chasm lizard—later the same year, in honor of Dr. Robert Bell and for the wide openings in an ornate bony frill that protruded from the rear of its skull.
Chasmosaurus is derived from the Greek "khasma" (wide opening/chasm/cleft) and "sauros" (lizard), named for the huge openings (fenestrae) in its frill.
The species epithet (or specific name), belli, honors Dr. Robert Bell, the then-administrative head of the Geological Survey of Canada.
The first fossils of Chasmosaurus were discovered in the Dinosaur Park Formation at Berry Creek, Dinosaur Provincial Park, Alberta, Canada by Lawrence Lambe in 1898.
The holotype (NMC 491) is part of a neck frill. A paratype (NMC 2245, including a skull and virtually complete skeleton with skin impressions), found by the Sternbergs in 1913 at the same site, was assigned by Lambe in February 1914 when he eventually settled on the name Chasmosaurus.
In 2011, a chasmosaurine skull that William Cutler had excavated from Alberta's Dinosaur Park Formation in 1919–1920 was referred to Chasmosaurus belli which, although almost complete, was found in bits, which allowed the inside of a chasmosaurine skull to be examined in detail for the first time.
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 80-73 mya
Est. max. length: 5.5 meters
Est. max. hip height: 1.6 meters
Est. max. weight: 3 tons
Diet: Herbivore
• Lambe LM (1902) "New genera and species from the Belly River Series (Mid - Cretaceous)". Geological Survey of Canada Contributions to Canadian Palaeontology.
• Lambe LM (January 1914) "On the forelimb of a carnivorous dinosaur from the Belly River Formation of Alberta, and a new genus of Ceratopsia from the same horizon, with remarks on the integument of some Cretaceous herbivorous dinosaurs". The Ottawa Naturalist 27(10): 129-135. [Protorosaurus.]
• Lambe LM (1914) " On Gryposaurus notabilis, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus belli". The Ottawa Naturalist  27(11): 145-155. [Coins Chasmosaurus]
• Sampson SD, MA Loewen, AA Farke, EM Roberts, CA Forster, et al. (2010) "New Horned Dinosaurs from Utah Provide Evidence for Intracontinental Dinosaur Endemism". [image credit]
• Currie PJ and EB Koppelhus (2005) "Ornithischian dinosaurs" in Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed.
• Lucas SG, RM Sullivan, AP Hunt (2006) "Re-evaluation of Pentaceratops and Chasmosaurus in the Upper Cretaceous of the Western Interior". New Mexico Museum of Natural History & Science, Bulletin 35.
• Longrich NR (2010) "Mojoceratops perifania, A New Chasmosaurine Ceratopsid from the Late Campanian of Western Canada". Journal of Paleontology 84(4): 681-694. doi: 10.1666/09-114.1
• Maidment SCR and Barrett PM (2011) "A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaur". Zootaxa, 2963: 1-47.
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To cite this page:
Atkinson, L. "CHASMOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 22nd Feb 2018.