imaginal disc


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imaginal disc

a structure found in the pupae of ENDOPTERYGOTES, formed by a thickening of the epidermis and underlying tissue, and which, on metamorphosis, gives rise to an adult structure.
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We chose these particular groups of late third-instar larvae because they are often collected for sampling of larval tissues and imaginal discs.
In the late third-instar larva, X-gal staining of [Beta]-galactosidase activity was found in the anterior and posterior spiracles, larval midintestine, lymph glands, cellular epidermis and in imaginal discs of the eye and antenna [ILLUSTRATION FOR FIGURE 2 OMITTED
Light staining was found in the larval lymph glands [ILLUSTRATION FOR FIGURE 3 OMITTED] and eye and antenna imaginal discs of some active larvae [ILLUSTRATION FOR FIGURE 4 OMITTED
Unique for pilidial development is the formation of the juvenile body from seven or eight separate rudiments, called imaginal discs (Salensky, 1912; Maslakova, 2010a).
Schmidt (1930) published a description of larval development in Cerebratulus marginatus from fertilization to the formation of imaginal discs, but did not observe late development or metamorphosis.
In the pupal period, there is destruction and reorganization of most larval tissues, but also the formation de novo of part of the adult tissues from imaginal discs (i.