An oblong, cylindrical structure composed of the skin of the mature larva of flies, which hardens and turns brown. The pupa is formed inside the puparium, and the adult fly emerges from this structure.

in some Diptera, the hardened skin of the last larval instar which becomes a protective covering for the pupa

The hardened, thickened skin of a mature larva within which the pupa and adult are formed.

The hardened, cocoon-like structure, unique to Diptera, which develops from the cast 3rd instar skin, within which metamorphosis from pupa to adult takes place.

The hardened cuticle of the last larval stage, within which a maggot forms a pupa and metamorphoses into an adult stage.