orrhropod ancestor 



Thysanura 



Odonata 



Neuroptero 



SiphonopTera 



Anoplura 



Ephemeroptera 



Orthoptera 



Diptera 



Lepidoptera 



Womoptera Wemiptera Wymenoptero 



ColeoDtera 



Fig. 11-17. The common orders of insects. 



