The Class Insecta is the second class of arthropods that we will discuss.
Adults have three pair of legs on the thorax.
Antennae and wings are present. There is no sexual dimorphism. As pests, they are a significant annoyance to many animals, including man. Additionally, some species are important as vectors for significant disease agents effecting both man and animals. The head is narrow in proportion to the length of the mandibles and the body is not chitinized.