While Marsh was describing Camptosaurus species in North America, numerous species from Europe were also referred to the genus in the late 19th and early 20th centuries: C. inkeyi, C. hoggii, C. leedsi, C. prestwichi, and C. valdensis.
Dok je Marsh opisivao vrste Camptosaurusa u Sjevernoj Americi, brojne europske vrste priključene su ovom rodu u kasnom 19. i ranom 20. stoljeću: C. inkeyi, C. hoggii, C. leedsi, C. prestwichi i C. valdensis.