 In 2015, it was renamed as the separate genus "Galeamopus", and several other "Diplodocus" specimens were referred to that genus, leaving no definite "Diplodocus" skulls known.The two Morrison Formation sauropod genera "Diplodocus" and "Barosaurus" had very similar limb bones.In the past, many isolated limb bones were automatically attributed to "Diplodocus", but may, in fact, have belonged to "Barosaurus".