 Its syntype series consists of eleven separate tail vertebrae, (specimina OUMNH J13693–13703), some sacral ribs with a foot bone (metatarsal, OUMNH J13704–13712), a hand bone (metacarpal, OUMNH J13748), and a claw (OUMNH J13721), probably from different fossil sites and different individuals.The ICZN accepted the proposal to change the type species in 2014 (Opinion 2331), officially making "C. oxoniensis" the type species in place of the original "C. medius".Making "C. oxoniensis" the type species of "Cetiosaurus" secured the name "Cetiosaurus" for the animal with which it has been traditionally associated.