Predominant group of arthropods, placed within the class Hexapoda along with the Protura, Collembola, and Diplura. The only group other than vertebrates to have developed flight.
- Order Archaeognatha (Jumping bristletails)
- Order Monura - extinct
- Order Thysanura (Common bristletails: silverfish, firebrats)
- Pterygota, the winged insects
- Order Palaeodictyoptera - extinct
- ...
- Order Ephemeroptera (Mayflies)
- Order Odonata (Dragonflies and damselflies)
- Neoptera, insects with folding wings
- Order Blattodea (Cockroaches)
- Order Mantodea (Mantids)
- Order Isoptera (Termites)
- Order Zoraptera (Zorapterans)
- Order Grylloblattodea (Ice Insects)
- Order Dermaptera (Earwigs)
- Order Plecoptera (Stoneflies)
- Order Orthoptera (Grasshoppers, crickets, and katydids)
- Order Phasmatodea (Walking sticks, timemas)
- Order Embioptera (Webspinners)
- Various extinct orders
- Hemipterodea
- Order Psocoptera (Booklice and barklice)
- Order Pthiraptera (Sucking and chewing lice)
- Order Hemiptera (True bugs, cicadas and kin - formerly Heteroptera + Homoptera)
- Order Thysanoptera (Thrips)
- Endopterygota, insects with complete metamorphosis
- Order Miomoptera - extinct
- Order Megaloptera (Alderflies, dobsonflies, and fishflies)
- Order Raphidioptera (Snakeflies)
- Order Neuroptera (Net-veined insects)
- Order Coleoptera (Beetles)
- Order Strepsiptera (Twisted-winged parasites)
- Order Mecoptera (Scorpionflies and kin)
- Order Siphonaptera (Fleas)
- Order Diptera (Flies)
- Order Trichoptera (Caddisflies)
- Order Lepidoptera (Butterflies and moths)
- Order Hymenoptera (Bees, ants, wasps, sawflies, and kin)
Let's not overlook the (genus?) Nupedia, a kind of fly! ;-)