Drosophila equinoxialis

Drosophila equinoxialis is a species of fruit fly belonging to the genus Drosophila, which comprises about 1,500 species. These small insects are widely used in genetic and evolutionary research due to their short life cycles and ease of breeding.1

Drosophila species, including D. equinoxialis, are studied in the context of geographic speciation. This process occurs when populations become separated by geographical barriers, leading to genetic divergence. For example, subspecies of D. equinoxialis found in continental South America and Central America/Caribbean exhibit reproductive isolation, with laboratory crosses producing sterile males. This reproductive isolation, even with minimal physical differences, is a key aspect of how new species evolve.2