Métamorphose de l'intestin antérieur et de l'intestin moyen chez Tenebrio molitor L. (Insecte, Coléoptère)

Abstract

The foregut and midgut of male and female Tenebrio molitor were studied just before and during metamorphosis. Three successive stages can be recognized by characteristic features of the cuticle and epithelium of the foregut, and of the peritrophic sheath, epithelium, basal lamina, and muscular connective sheath of the midgut. In the external integument, changes occur during two periods, implying two reprogramming phases. Overall, periods of change for the gut are concomitant with first the pupal molt and then the imaginal molt. However, in the foregut, cuticular secretion begins later than in the integument and is completed at the time of ecdysis. For the midgut, imaginal differentiation is slow and ends a few days after ecdysis.