ex·u·vi·ae 
(ĭg-zvē-ē′)
(ĭg-zvē-ē′)pl.n.
The cast-off skins or coverings of various organisms, such as the shells of crabs or the external coverings of the larvae and nymphs of insects.
[Latin, from exuere, to take off; see eu- in the Appendix of Indo-European roots.]
ex·uvi·al (-vē-əl) adj.
exuviaea newly emerged cicada with its brown exuviae