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Sub-class: Apterygota Wingless insects with body structure suggesting that they have never had wings during their evolutionary history. Young stages resemble the adults - little or no metamorphosis. Thysanura (Bristletails) Diplura (Two-pronged Bristletails) Protura Collembola (Springtails) Sub-class: Pterygota Winged insects Division: Exopterygota Winged insects with wings developed externally and no marked change during the life cycle. The young stages, called nymphs, resemble the adults except in size and in lacking fully-developed wings. (Some have lost their wings during the course of evolution) Ephemeroptera (Mayflies) Odonata (Dragonflies) Plecoptera (Stoneflies) Grylloblattodea [No British species] Orthoptera (Crickets, Grasshoppers and Locusts) Phasmida (Stick and Leaf Insects) Dermaptera (Earwigs) Embioptera (Web-spinners) Dictyoptera (Cockroaches and Mantids) Isoptera (Termites) Zoraptera [No British species] Psocoptera (Psocids or Booklice) Mallophaga (Biting Lice) Siphunculata = Anoplura (Sucking Lice) Hemiptera (True Bugs) Thysanoptera (Thrips) Division: Endopterygota Winged insects with wings developed internally (i.e. inside the body of the immature insect) and a marked change (metamorphosis) during the life cycle. The young (larvae) stages are very different from the adults. The change from larva to adult takes place during a non-feeding stage called the pupa or chrysalis. (Some have lost their wings during the course of evolution) Mecoptera (Scorpion Flies) Siphonaptera (Fleas) Diptera (True Flies) Lepidoptera (Butterflies & Moths) Trichoptera (Caddis Flies) Hymenoptera (Bees, Wasps & Ants) 
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