 Of the four species named in Owen's second 1842 article, "C. brevis", "C. brachyurus", "C. longus" and "C. medius", only "C. brevis " would not be a "nomen dubium".This they interpreted as implying that "C. brevis" was the type species.This conclusion, if correct, would cause considerable taxonomic instability, because the genus "Pelorosaurus" had since been based on its fossils, and recognized as a totally different kind of sauropod.