Atlas of Drosophila Development by Volker Hartenstein | Table of Contents |
Select image to enlarge in new window Intestinal Tract pages 28-29 | 30-31 | 32-33 | 34 | 35
The epithelium of the larval gut degenerates completely
and is replaced during the prepupal and early pupal period by imaginal cells
(Robertson 1936; Bodenstein 1950). Precursors of the imaginal gut (drawn in
dark blue or red) are integrated into the larval gut epithelium (drawn in light
blue or red, respectively); they can already be identified at early larval
stages (Hartenstein and Jan 1992). In the third instar larva, precursors of the
adult foregut are concentrated in a so-called imaginal ring (imr) located
in the proventriculus (pv), The pharynx is replaced by cells of
the labial imaginal discs (id), The adult salivary duct (sd) and glands (sg) originate from a pair of imaginal rings (imr) surrounding
the proximal tips of the larval salivary glands. The midgut is replaced by
midgut histoblasts (mhi) scattered throughout the larval midgut
epithelium (mg). Precursors of the adult hindgut (hg) lie
in an imaginal ring located at the junction between larval hindgut and midgut;
the posterior hindgut is replaced by cells originating in the genital disc (gd). The larval Malpighian tubules (mp) persist into the adult. |
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