Hypsilophodon Foxii meaning “Hypsilophus-tooth”) is an ornithischian dinosaur genus from the Early Cretaceous period of England. It has traditionally been considered an early member of the group Ornithopoda, but a 2017 analysis questioned this.
The first remains of Hypsilophodon were found in 1849; the type species, Hypsilophodon foxii, was named in 1869. Abundant fossil discoveries were made on the Isle of Wight, giving a good impression of the build of the species. It was a small bipedal animal with an herbivorous or possibly omnivorous diet.
reached a length of 2.3 metres (7.5 ft), and was also found outside of Wight. During the past decades new research has gradually shown this to be incorrect.