Thorax (arthropod anatomy)
It is formed by the prothorax, mesothorax and metathorax and comprises the scutellum; the cervix, a membrane that separates the head from the thorax; and the pleuron, a lateral sclerite of the thorax.
Members of suborder Apocrita (wasps, ants and bees) in the order Hymenoptera have the first segment of the abdomen fused with the thorax, which is called the propodeum. The head is connected to the thorax by the occipital foramen, enabling a wide range of motion for the head. 
In most flying insects, the thorax allows for the use of asynchronous muscles.
- Theischinger, Günther; Hawking, John (2006). The Complete Field Guide to Dragonflies of Australia. Collingwood Vic.: CSIRO Publishing. p. 303. ISBN 978 0 64309 073 6.
- Tillyard, R. J. (1917). The Biology of Dragonflies (PDF). Cambridge University Press. p. 20. Archived (PDF) from the original on July 3, 2017.
- Legner, Elrich Fred. "General Summary of the Hymenoptera". An Introduction to the Study of Entomology.
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