Hermit crabs are decapod crustaceans.
 Several other groups of crustaceans with similar appearances  such as king crabs and porcelain crabs  are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation
 It is still a subject of debate whether a monophyletic group is formed by those crabs where the female, but not male, gonopores are situated on the sternum

