I. valdensis , a renaming of Vectisaurus valdensis by Ernst van denned Broeck in 1900 . Originally named Vectisaurus valdensis by Hulke in 1879 based on vertebral and pelvic remains , it was from the Barremian stage of the Isle of Wight . It was considered a juvenile specimen of Mantellisaurus atherfieldensis , or an undetermined species of Mantellisaurus , but is indeterminate beyond Iguanodontia .