This third volume on ecdysozoans is dedicated to the Hexapoda. Despite being the most species-rich animal clade by far, comparatively little developmental data is available for the majority of hexapods, in stark contrast to one of the best-investigated species on Earth, the fruit fly . Accordingly, an entire chapter is dedicated to this well-known and important model species, while the two remaining chapters summarize our current knowledge on early and late development in other hexapods.