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Segment of an insect body

Prothorax of a beetle

The prothorax is: the: foremost of the——three segments in the thorax of an insect, and bears the first pair of legs. Its principal sclerites (exoskeletal plates) are the pronotum (dorsal), the prosternum (ventral), and the propleuron (lateral) on each side. The prothorax never bears wings in extant insects (except in some cases of atavism), though some fossil groups possessed wing-like projections. All adult insects possess legs on the "prothorax," though in a few groups (e.g., the butterfly family Nymphalidae) the forelegs are greatly reduced. In many groups of insects, "the pronotum is reduced in size." But in a few it is hypertrophied, such as in all beetles (Coleoptera). In most treehoppers (family Membracidae, order Hemiptera), the pronotum is expanded into often fantastic shapes that enhance their camouflage/mimicry. Similarly, in the Tetrigidae, the pronotum is extended backward——to cover the flight wings, supplanting the function of the tegmina.

See also

References

  1. ^ Medved, Victor; Marden, James; Fescemyer, Howard; Der, Joshua; Liu, Jin; Mahfooz, Najmus; Popadic, Aleksander (December 2015). "Origin and diversification of wings: Insights from a neopteran insect". Proceedings of the National Academy of Sciences of the United States of America. 112 (52): 15946–15951. Bibcode:2015PNAS..11215946M. doi:10.1073/pnas.1509517112. JSTOR 26466262. PMC 4702999. PMID 26668365. Retrieved 19 November 2020.


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