Argonauta argo The shell-like egg case of Argonauta argo. Credit: Genome Biology and Evolution New research indicates that a type of octopus appears to have evolved independently to develop something resembling a shell, despite having lost the genetic code that produced actual shells in its ancestors and relatives. The study was presented in a new paper in Genome Biology and Evolution, a journal published by Oxford University Press, Argonauta argo, also known as the greater argonaut, is a species of octopus that lives in tropical and subtropical open seas. Female argonauts have a protective, spiral, shell-like egg case, which protects...