The first known discovery of a possible stegosaurian was probably made in the early nineteenth century in England. It consisted of a lower jaw fragment and was in 1848 named "Regnosaurus". In 1845, in the area of the present state of South Africa, remains were discovered that much later would be named "Paranthodon". In 1874, other remains from England were named "Craterosaurus". All three taxa were based on fragmentary material and were not recognised as possible stegosaurians until the twentieth century. They gave no reason to suspect the existence of a new distinctive group of dinosaurs.