The medium-sized herbivore once roamed the floodplains of what is now the island’s south-west coast.
Its remains, which date back 125 million years, were originally discovered by fossil hunter Nick Chase, who died of cancer in 2019.
Before Dr Lockwood’s analysis the fossils were assumed to have belonged to one of the two known iguanodontian dinosaur species from the Isle of Wight.
He said: “While the skeleton wasn’t as complete as some of the others that have been found, no-one had really taken a close look at these bones before.
“It was thought to be just another specimen of one of the existing species, but this one had particularly long neural spines, which was very unusual.
“It may have been used for display, much like a peacock’s feathers, possibly to attract mates or intimidate rivals.”
For the study, researchers compared the fossilised bones with a database of similar dinosaur back bones which allowed them to see how these sail-like formations had evolved.
