Front region of Maggot of Blow-fly (Calliphora) showing diagrammatically the imaginal discs, which are shaded.
Here the imaginal stage only is omitted from the life-history.
Not until spring is the pupal form assumed, and then it quickly passes into the imaginal state.
Discota: insects in which development of the adults is from imaginal discs: see adiscota.
Oculocephalic: applied to that pair of imaginal buds destined to produce the cephalic region in Hymenoptera.
Not the wings only, but other structures of the imago, varying in extent in different orders, are formed from the imaginal discs.
(A. Prorsa-Levana), which, like the genus Pyrameis, is entirely based on imaginal characters.
Hence we understand that the amputation of the latter by the old naturalists truncated only and did not destroy the imaginal limb.
A similar though less extreme shortening of the imaginal life may be noticed in many endopterygote insects.
A curious segmental displacement of the imaginal discs with regard to the larva is noticeable in some Diptera.