Aerial
Guides
Insecta
Insects
Insects constitute the largest and most diverse class of arthropods, comprising more than one million described species with estimates of total species ranging from 2 to 30 million. They are characterized by a three-part body plan (head, thorax, abdomen), three pairs of jointed legs, compound eyes, and one pair of antennae. Insects occupy virtually every terrestrial and freshwater habitat, and many have colonized marine environments. Their ecological dominance stems from extraordinary diversity in form, function, and life history strategies.