Inverted thickenings of epidermis containing mesodermal cells found in a holometabolous insect. During the pupal stage, the imaginal discs give rise to the adult organs, and most larval structures are destroyed. See Chronology, 1973, Garcia-Bellido et al.; 1975, Morata and Lawrence; compartmentalization, in vivo culturing of imaginal discs.
Subjects: Genetics and Genomics.