Pterygota

Pterygotes (Subclass Pterygota) are by far the largest group of insects, making up 99.9% of all insects in real life. They include all winged insects and the orders that are secondarily wingless (that is, insect groups whose ancestors once had wings but that have lost them as a result of subsequent evolution).

Orders not included within Pterygota are the jumping bristletails, as well as the silverfish and firebrats. Unlike these two groups, the pterygotes don't have styli or vesicles on their abdomen (also absent in some zygentomans), and with the exception of the majority of mayflies, are also missing the median terminal filament which is present in the ancestrally wingless insects.