During its life cycle, the vinegar fly Drosophila melanogaster goes through an embryo stage and three larval stages, or instars, during which they increase their size around 200 times. The 3rd larval instar is followed by a sessile stage in which the pupa is formed. Being a holometabolous insect, the adult Drosophila fly is formed through metamorphosis. During the pre-pupal stage, most larval tissues are hydrolyzed via autophagy, providing nutrients and energy for the proliferation and differentiation of the adult fly tissues during metamorphosis. Morphological differences can be appreciated in this species between males and females, a feature called sexual dimorphism. Broadly speaking, females are generally larger than males. In the posterior ventral region of the female abdomen, the anal plates and ovoid plates, which are lightly pigmented, can be identified. Males, on the other hand, have in this same region anal plates and genital arches with darker coloration. Likewise, the front legs of males have characteristic sexual combs, which they use to hold the females during copulation.
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