Soldier crab is a term used in different parts of the world for different crustaceans: Pagurus bernhardus, a European hermit crab Coenobita clypeatus, a Caribbean hermit crab Dotilla myctiroides, a true crab from South-east Asia several species of the genus Mictyris, an Indo-West Pacific genus of crabs: In Australia, the term soldier crab generally refers to Mictyris longicarpus