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a plant-eating styracosternan iguanodont dinosaur from the Late Jurassic of England.
Pronunciation: kum-NOH-ree-uh
Meaning: for Cumnor
Author/s: Seeley (1888)
Synonyms: Camptosaurus prestwichii
First Discovery: Cumnor, England
Chart Position: 47

Cumnoria prestwichii

Initially dumped on a rubbish heap by workers at Chawley Brick Pits, the remains that would become Cumnoria were eventually bagged up and carted off to Professor George Rolleston of Oxford University. Unsure of their owners identity, Rolliston showed the fossils to palaeontologist Joseph Prestwich who reported them as a new species of Iguanodon, though the remains didn't receive a species epithet until John Whitaker Hulke announced Iguanodon Prestwichii (honoring Prestwich) to the world in 1880.

In 1888, Harry Govier Seeley decided the taxon represented a hitherto unknown species which he named Cumnoria prestwichi (complete with spelling mistake!) but it only lasted a year before Richard Lydekker assigned the remains to a new species of Camptosaurus, Camptosaurus prestwichii. Over a century passed before doubts were cast on Lydekker's opinion, first by David Norman in 1998 then by Darren Naish and David Martill in 2008. A 2010 analyses by Andrew T. McDonald confirmed that Seeley was right, Cumnoria is distinct and valid, and rather than being a rather small and gracile camptosaurid it appears to be the oldest known member of Styracosterna; the group of "advanced" iguanodonts containing the hadrosaurids and all dinosaurs closer to them than to camptosaurids.

As poorly populated as Camptosauridae is, it still attracts a huge ammount of attention, and 2015 heralded yet another review, but this time its members were bolstered. Ken Carpenter re-assigned a braincase from McDonald's Uteodon to Dryptosaurus because its "unique" features were the result of distortion, and moved the rest of its remains back to Camptosaurus aphanoecetes which he coined himself in 2008. To complete a double whammy, Carpenter also undid McDonald's Cumnoria, returning it to Lydekker's Camptosaurus prestwichii, but we're expecting retaliation from the latter author any time now.
Cumnoria is named after Cumnor Hurst—a village 3.5 miles from the centre of Oxford—where the remains were discovered.
The species epithet, prestwichii, honors English geologist Joseph Prestwich.
The fossils of Cumnoria were discovered in the lower Kimmeridge Clay Formation, Chawley Brick Pits, Cumnor Hurst (also known as Hurst Hill), by workers at the pit in 1879.
The holotype (OXFUM J.3303) is a partial skull and skeleton, probably juvenile.
Era: Mesozoic
Epoch: Late Jurassic
Stage: Kimmeridgian
Age range: 156-151 mya
Est. max. length: 5 meters
Est. max. hip height: ?
Est. max. weight: 250 Kg
Diet: Herbivore
• Prestwich J (May 1879) "On the discovery of a species of Iguanodon in the Kimmeridge Clay near Oxford; and a notice of a very fossiliferous band of the Shotover Sands". Geological Magazine, Volume 6, Issue 5, pp. 193-195.
• Prestwich J (1880) "Note on the occurence of a new species of Iguanodon in a brickpit of the Kimmeridge Clay at Cumnor Hurst, three miles W.S.W. of Oxford". Quarterly Journal of the Geological Society of London, 36: 430-432.
• Hulke JW (1880) "Iguanodon prestwichii, a new species from the Kimmeridge Clay, distinguished from I. mantelli of the Wealden Formation in the S.E. of England and Isle of Wight by differences in the shape of the vertebral centra, by fewer than five sacral vertebrae, by the simpler character of its tooth-serrature, etc., founded on numerous fossil remains lately discovered at Cumnor, near Oxford". Quarterly Journal of the Geological Society of London. 36 (143): 433–456.
• Seeley HG (1888) "On Cumnoria, an iguanodont genus founded upon the Iguanodon prestwichi, Hulke". Report of the British Association for the Advancement of Science. 57: 698.
• Norman D (1998) "On Asian ornithopods (Dinosauria: Ornithischia). 3. A new species of iguanodontid dinosaur". Zoological Journal of the Linnean Society. 122: 291–348.
• Naish D and Martill DM (2008) "Dinosaurs of Great Britain and the role of the Geological Society of London in their discovery: Ornithischia". Journal of the Geological Society of London. 165 (3): 613–623.
• McDonald AT (2011) "The taxonomy of species assigned to Camptosaurus (Dinosauria: Ornithopoda)". Zootaxa. 2783: 52–68.
• Carpenter K and Lamanna MC (2015) "The Braincase Assigned to the Ornithopod Dinosaur Uteodon McDonald, 2011, Reassigned to Dryosaurus Marsh, 1894: Implications for Iguanodontian Morphology and Taxonomy". Annals of Carnegie Museum 83(2): 149-165.
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To cite this page:
Atkinson, L. "CUMNORIA :: from DinoChecker's dinosaur archive".
›. Web access: 18th Feb 2018.