The world of insects
External features of insects - structure and function
The major divisions of the Insecta
Subclass Apterygota
Subclass Pterygota, division Exopterygota, Palaeopteran orders
Subclass Pterygota, division Exopterygota, Orthopteroid orders
Subclass Pterygota, division Exopterygota, Hemipteroid orders
Subclass Pterygota, division Endopterygota, lesser orders
Subclass Pterygota, division Endopterygota, order Lepidoptera (butterflies and moths)
Subclass Pterygota, division Endopterygota, order Diptera (true flies)
Subclass Pterygota, division Endopterygota, order Hymenoptera (sawflies, ants, bees and wasps)
Subclass Pterygota, division Endopterygota, order Coleoptera (beetles)
Class Arachnida.