Exuvia
（重定向自Exuvium）
Exuviae is a term used in biology to describe the remains of an exoskeleton and related structures that are left after ecdysozoans (including insect, crustacean or arachnid) have moulted. The exuviae of an animal can be important to biologists as it can often be used to identify the species of the animal and even its sex.