Leafhopper exuvia

Exuviae is a term used in biology to describe the remains of an exoskeleton and related structures that are left after insects, crustaceans or arachnids have molted. The exuvia 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. "Exuvia" is a derived singular usage that is becoming more common; "exuvium" is an incorrect singular formation.