 Therefore, Upchurch & Martin suggested to request the ICZN to change the type species into "C. oxoniensis", the best known species from the Middle Jurassic, which the genus "Cetiosaurus" had generally come to be identified with.However, in 2009, when their request was officially filed, Upchurch and Martin had changed their position.They acknowledged that being designated a "nomen dubium" does not prevent a species from having been made the type of a genus.