Pterygota
Pterygota is a subdivision of insects that includes all winged insects and lineages in which wings have been secondarily lost. The name derives from the Greek pteron, meaning wing. In many classifications, Pterygota is divided into two major groups: Paleoptera and Neoptera. Paleoptera comprises Ephemeroptera (mayflies) and Odonata (dragonflies and damselflies); their wings cannot be folded flat over the abdomen. Neoptera includes the vast majority of living winged insects, such as beetles (Coleoptera), butterflies and moths (Lepidoptera), flies (Diptera), bees, wasps, and ants (Hymenoptera), true bugs (Hemiptera), grasshoppers and crickets (Orthoptera), earwigs (Dermaptera), mantises (Mantodea), and cockroaches and termites (Blattodea and related groups).
Wings are a defining feature of the group, though many extant lineages have lost or reduced wings
In modern systematics, Pterygota encompasses the majority of living insects and underpins much of insect diversity,