A single-layered pouch of undifferentiated cells in insect larval stages that gives rise to adult structures such as the wings, legs, antennae and eyes.

In insect larvae, groups of cells that develop into specific adult organs.

a larval tissue that gives rise to an adult structure in organisms such as Drosophila

bisc333 One of a series of disc-shaped structures in a fruit fly embryo which are located symmetrically along either side of the body. The imaginal discs are present within the larva and eventually develop into the body parts of the adult fruit fly during the pupal stage. http://searchbox.hyperdictionary.com/dictionary/imaginal+disc

An imaginal disc is one of the parts of a holometabolous insect larva that will become a portion of the outside of the adult insect during the pupal transformation. Contained within the body of the larva, there are pairs of discs that will form, for instance, the wings or legs or antennas or other structures in the adult. During the pupal stage, many larval structures are broken down, and adult structures, including the discs, undergo rapid development.