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a plant-eating saurolophine hadrosauroid dinosaur from the Late Cretaceous of Canada.
Pronunciation: GRIP-o-SOR-us
Meaning: Hook-nosed lizard
Author/s: Lambe (1914)
Synonyms: Hadrosauravus
First Discovery: Alberta, Canada
Chart Position: 84

Gryposaurus notabilis

Just three years after its discovery by George Sternberg along the Red Deer River in 1913, Barnum Brown snaffled the arched snout of Gryposaurus to replace the Anatotitan-like flat and ducky one he had used to reconstruct Kritosaurus in 1910. As if that wasn't bad enough, he opined that Gryposaurus and Kritosaurus were two specimens of the same critter, with the latter having priority, obviously. Unfortunately for Gryposaurus, Lull and Wright agreed, cementing the synonymy in favour of Kritosaurus in their 1942 hadrosaur masterpiece, and so it remained for over half a century.

By the 1990's question marks were being raised about the validity of Kritosaurus because its remains are light on parts that are actually comparable to other hadrosaurs. Gryposaurus, however, is gaining momentum despite a brief stint as a species of Hadrosaurus—Jack Horner's Hadrosaurus [Kritosaurus] notabilis—in 1979, thanks to dozens of specimens including at least ten complete skulls.
Gryposaurus is derived from the Greek "grypos" (crooked, curved, hook-nosed) and "sauros" (lizard) alluding to its most prominent feature; a hooked "Roman nose", which is actually an arch on its snout formed by two nasal bones.
The species epithet, notabilis (no-TAY-bi-lis), means "remarkable" (in Latin) and refers to its remarkably well preserved skull.
The first fossils of Gryposaurus were discovered along the Red Deer River in the Dinosaur Park Formation of Alberta, Canada, by George F. Sternberg in 1913.
The holotype (NMC 2278) is a skull and partial skeleton.
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 84-73 mya
Est. max. length: 8.5 meters
Est. max. hip height: ?
Est. max. weight: 2 tons
Diet: Herbivore
Other Species
Gryposaurus latidens
Collected from the Lower Two Medicine Formation of Pondera County, Montana, for the American Museum of Natural History in 1916, the remains that would become Gryposaurus latidens—partial skulls and skeletons from several individuals— were studied and informerly tagged "Hadrosauravus" in 1990 by David Lambert. An official description never materialised, presumably because he had second thoughts about its validity, and Jack Horner assigned it to Gryposaurus in 1992.
Gryposaurus monumentensis
Decribed as "the Arnold Schwarzenegger of duck-billed dinosaurs" Gryposaurus monumentensis was discovered in the Kaiparowits Formation of Utah, in Grand Staircase-Escalante National Monument in 2002. Known from a partial skeleton with skin impressions, its skull was massive and robust with a huge, relatively short jaw compared to other species of Gryposaurus which could only mean increased chewing power. Not only did the discovery of Gryposaurus monumentensis stretch the geographic range of this genus from Alberta to Utah it also stetched its timespan to more than five million years.
Gryposaurus incurvimanus
Originally named Kritosaurus incurvimanus by William Parks in 1920, Gryposaurus incurvimanus was discovered in the same formation as Gryposaurus notabilis and turned out to be Gryposaurus notabilis. It is the best specimen, with preserved skin inpressions showing limpet-shaped scutes on its flank and tail, polygonal scales on its neck and sides of the body, and short, fluted pyramid-like "spines" along the midline of its back.
• Brown, Barnum (1910) "The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus Kritosaurus".
• Lawrence M. Lambe (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".
• William A. Parks (1920) "The osteology of the trachodont dinosaur Kritosaurus incurvimanus".
• J.R. Horner, D.B. Weishampel and C.A. Forster (2004) "Hadrosauridae" in Weishampel, Dodson and Osmólska (eds.) "The Dinosauria: Second Edition".
• Philip J. Currie and Eva B. Koppelhus (2005) "Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed". /uk.
• Terry A. Gates and Scott D. Sampson (2007) "A new species of Gryposaurus (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, USA."
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To cite this page:
Atkinson, L. "GRYPOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 27th May 2017.