Claim: Sepia hieronis is a species of cuttlefish that grows to a mantle length of 70 mm and can be found in the Great Chagos Bank.
Evidence: Sepia hieronis is a species of cuttlefish native to the southeastern Atlantic Ocean and southwestern Indian Ocean, specifically southern Namibia, from approximately 27°S to Port Alfred, South Africa, and east Africa from 17°S to Kenya and Mozambique. It is also present in the Saya-de-Malha Bank.