A mesopelagic scaled squid, Pholidoteuthis massyae, was found for the first time in the south-west Atlantic, and an epi-mesobathyal octopus, Muusoctopus eureka, was found in shallow waters of the Falkland Islands almost a century after its last record there. These new records are tentatively attributed to recent climatic changes in oceanic waters of the southern hemisphere. Deimatic behaviour was recorded for the first time in an inkless octopus.