What is a defining feature of Diptera?

Diptera, commonly known as true flies, is characterized by having only one pair of wings. This unique feature is crucial for their classification within the order. While other insects typically have two pairs of wings, Diptera has evolved specialized structures called halteres in place of the second pair. These halteres serve as balancing organs during flight, enabling flies to maneuver effectively.

The distinction of having a single pair of wings is essential for identifying Diptera and understanding their biology and behavior as it has adaptations that contribute to their aerial agility and ecological roles, such as pollination and decomposition.