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. |