Hypsilophodon
Despite living in the Cretaceous, Hypsilophodon had a number of primitive, or basal, features. For example, there were five fingers on each 'hand' and four on each foot. Most dinosaurs had fewer digits by the Cretaceous period. Also, although it had a beak, Hypsilophodon still had pointed triangular teeth in the front of the jaw. Most herbivorous dinosaurs had, by this stage, lost the front teeth altogether (although there is some debate as to whether these teeth may have had a specialized function in Hypsilophodon).