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New species of iguanodontian dinosaur discovered from Isle of Wight

Date:
November 11, 2021
Source:
Taylor & Francis Group
Summary:
Discoveries of iguanodontian dinosaurs from the Isle of Wight have previously only been assigned to Iguanodon or Mantellisaurus . The diversity of dinosaurs in the Early Cretaceous of the UK is much greater than previously thought.
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Scientists from the Natural History Museum and University of Portsmouth have described a new genus and species of dinosaur from a specimen found on the Isle of Wight.

Following on from a new species of ankylosaur, new species of therapodand two new speciesof spinosaur dinosaurs,Brighstoneus simmondsiis the latest in a host of new dinosaur species described by Museum scientists in recent weeks.

The new dinosaur is an iguanodontian, a group that also includes the iconicIguanodonandMantellisaurus. Until now, iguanodontian material found from the Wealden Group (representing part of the Early Cretaceous period) on the Isle of Wight has usually been referred to as one of these two dinosaurs -- with more gracile fossil bones assigned toMantellisaurusand the larger and more robust material assigned toIguanodon.

However, when Dr Jeremy Lockwood -- a PhD student at the Museum and University of Portsmouth -- was examining the specimen, he came across several unique traits that distinguished it from either of these other dinosaurs.

'For me, the number of teeth was a sign' Dr Lockwood says. 'Mantellisaurushas 23 or 24, but this has 28. It also had a bulbous nose, whereas the other species have very straight noses. Altogether, these and other small differences made it very obviously a new species.'

The herbivorous dinosaur was about eight metres in length and weighed about 900kg. Published in the peer-reviewedJournal of Systematic Palaeontology, Dr Lockwood describes the species and names itBrighstoneus simmondsi:Brighstoneusafter the village of Brighstone, near to the excavation site, andsimmondsihonouring Mr Keith Simmonds, who made the discovery of the specimen in 1978.

The discovery of this new species suggests that there were far more iguanodontian dinosaurs in the Early Cretaceous of the UK than previously thought, and that simply assigning specimens from this period to eitherIguanodonorMantellisaurusmust change.

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'We're looking at six, maybe seven million years of deposits, and I think the genus lengths have been overestimated in the past, 'says Dr Lockwood. 'If that's the case on the island, we could be seeing many more new species. It seems so unlikely to just have two animals being exactly the same for millions of years without change.'

Museum scientist Dr Susannah Maidment, a co-author of the paper, says: 'The describing of this new species shows that there is clearly a greater diversity of iguanodontian dinosaurs in the Early Cretaceous of the UK than previously realised. It's also showing that the century-old paradigm that gracile iguanodontian bones found on the island belong toMantellisaurusand large elements belong toIguanodoncan no longer be substantiated'.

The Isle of Wight has long been associated with dinosaur discovery, and even yielded the crucial specimens that led to Sir Richard Owen to coin the termDinosauria. The authors conclude that the describing ofBrighstoneus simmondsias a new species calls for a reassessment of Isle of Wight material:

'British dinosaurs are certainly not something that's done and dusted at all,' says Dr Lockwood. 'I think we could be on to a bit of a renaissance.'

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Journal Reference:

  1. Jeremy A. F. Lockwood, David M. Martill, Susannah C. R. Maidment.A new hadrosauriform dinosaur from the Wessex Formation, Wealden Group (Early Cretaceous), of the Isle of Wight, southern England.Journal of Systematic Palaeontology, 2021; 1 DOI:10.1080/14772019.2021.1978005

Cite This Page:

Taylor & Francis Group. "New species of iguanodontian dinosaur discovered from Isle of Wight." ScienceDaily. ScienceDaily, 11 November 2021. /releases/2021/11/211111075443.htm>.
Taylor & Francis Group. (2021, November 11). New species of iguanodontian dinosaur discovered from Isle of Wight.ScienceDaily. Retrieved August 19, 2023 from www.koonmotors.com/releases/2021/11/211111075443.htm
Taylor & Francis Group. "New species of iguanodontian dinosaur discovered from Isle of Wight." ScienceDaily. www.koonmotors.com/releases/2021/11/211111075443.htm (accessed August 19, 2023).

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