However, in 1975 Peter Galton named them as a new species of "Dryosaurus": "Dryosaurus canaliculatus". The specific name means "with a small channel" in Latin, referring to a distinct groove between the condyles of the lower thighbone. In 1977 Galton named a new genus for them: "Valdosaurus", the name being derived from Latin "Valdus", "Wealden", a reference to the Wealden Group. Its type species, "D. canaliculatus", was thus renamed "V. canaliculatus". A second species, "V. nigeriensis", was described by Galton and Philippe Taquet from younger rocks from Niger in 1982; this has since been transferred to its own genus, "Elrhazosaurus".