skeletal duplicature

Outer chitinous body cover of conchostracans shed during ecdysis, individual duplicatures being very thin whitish translucent layer resembling entire animal when floating in water; may occur also in notostracans and cladocerans [Moore and McCormick, 1969].

(Order Cladocera):

Outer chitinous body cover shed during ecdysis [McLaughlin, 1980].