Nautilus and Allonautilus, last members of the once widespread nautiloid cephalopods, are today restricted to the deep central Indo-West Pacific Ocean, for reasons that remain unclear. Cephalopod evolution is generally considered as being driven by vertebrate predation; therefore, we investigated the role of whales and seals in the decline of nautiloids through the Cenozoic.
Financial support to SK was provided by the Swedish Research Council (Vetenskapsrådet) through grant 2016-03920, and to CHT by the Taiwan Ministry of Science and Technology through grant MOST 108-2621-B-002-006-MY3.