Most insects in the order Diptera are fairly easy to recognize, because of their characteristic shape. They have a single pair of membranous wings. The second pair is reduced to small knobbed structures called halters. A few dipterans have no wings at all. Insects in this order have large compound eyes, and their mouthparts are adapted for licking and sucking.
The larvae, also called maggots in some cases, look like small worms.
This huge group consists of more than 160,000 species divided into two suborders, depending on the size of their antennae:
These insects have longer antennae. They generally look like mosquitoes, with long legs, slender bodies, a fairly fragile appearance and segmented antennae.
These dipterans have shorter antennae and are shaped like house flies, with stockier bodies and fewer antenna segments.