Article: English hypsilophodontid dinosaurs (Reptilia: Ornithischia)

A premaxillary tooth from the Stonesfield Basin (Bathonian) of Stonesfield may represent the oldest hypsilophodontid described to date. However, small bones from the Lias (Jurassic) of Charmouth are not hypsilophodontid and were correctly referred to the primitive ankylosaur Scelidosaurus harrisoni. A femur from the Oxford Clay (Callovian) of Peterborough is regarded as an iguanodontid (Camptosaurus (?) leedsi Lydekker). A dentary tooth from the Kimmeridge Clays of Weymouth represents the oldest undoubted hypsilophodontid described to date from England. In addition to the well-known Hypsilophodonfoxii Huxley, a new Wealden species is tentatively referred to the genus Dryosaurus. Some Wealden specimens previously referred to Iguanodon are hypsilophodontid and represent individuals with a length of up to 4-2 m.