 Species were described from two other islands, but their existence is based on scant evidence.The purported Rábida Island species ("C. wallacei") was described from a single specimen collected by the California Academy of Sciences in December 1905, which has since been lost.This individual was probably an artificial introduction from another island that was originally penned on Rábida next to a good anchorage, as no contemporary whaling or sealing logs mention removing tortoises from this island.