|Aedes aegypti, a disease-carrying mosquito|
The Nematocera are a large suborder of flies which include the mosquitoes and midges. They usually have long thin bodies, with segmented antennae. Usually their larvae are aquatic, but there are many exceptions to this.
Many species form mating swarms of males, and in some of these, competition for females is extreme. Although many species (as larvae) have a strong association with water, even within a single family there may be a trend toward semiaquatic and terrestrial habitats.