Which of the following is not found on mosquitoes?

The correct answer is that mosquitoes do not have two pairs of wings. Instead, mosquitoes possess one pair of functional wings, which are essential for their ability to fly. The other pair of wings, known as halteres, has evolved into small club-like structures that assist with balance during flight, but they are not used for flying like the main pair of wings. This adaptation allows mosquitoes to be agile fliers.

In contrast, long antennae are a notable characteristic of mosquitoes, aiding in their ability to detect scents and pheromones. Compound eyes are also prominent in mosquitoes, enabling them to see in multiple directions and detect movement, which is crucial for avoiding predators and locating hosts. Lastly, mosquitoes have specialized mouthparts designed for feeding, particularly when they are in their blood-feeding state. These mouthparts include a long proboscis that allows them to pierce the skin of their hosts to draw blood. Each of these features plays a significant role in the mosquito's lifecycle and behavior, emphasizing the uniqueness of their anatomy.