 Iguanodon mantelli described by Christian Erich Hermann von Meyer in 1832 , was based on the same material as I. anglicus and is an objective junior synonym of the latter . Several taxa , including the holotype of Dollodon and Mantellodon , but also the dubious <unk> Trachodon <unk> the <unk> Hypsilophodon , and <unk> , were previously mis @-@ assigned to I. mantelli . 
