Elytron

For the elytra of annelids, see Elytron (annelid anatomy). For the academic journal, see Elytron (journal).
The elytra of this cockchafer beetle are readily distinguished from the transparent hindwings.

An elytron (/ˈɛlətrɒn/;[1] from Ancient Greek ἔλυτρον (élutron) 'sheath, cover'; pl.: elytra, /ˈɛlətrə/)[1][2][3][4] is a modified, hardened forewing of beetles (Coleoptera), though a few of the true bugs (Hemiptera) such as the family Schizopteridae are extremely similar; in true bugs, the forewings are called hemelytra (sometimes alternatively spelled as "hemielytra"), and in most species only the basal half is thickened while the apex is membranous, but when they are entirely thickened the condition is referred to as "coleopteroid".[5] An elytron is sometimes also referred to as a shard.[6]

Hemelytra in Schizopteridae; figures B and C are considered "coleopteroid" as they lack membrane
Ripiphorus fasciatus-complex, female

Description

The elytra primarily serve as protective wing-cases for the hindwings underneath, which are used for flying. To fly, a beetle typically opens the elytra and then extends the hindwings, flying while still holding the elytra open, though many beetles in the families Scarabaeidae and Buprestidae can fly with the elytra closed (e.g., most Cetoniinae; [7]).

In a number of groups, the elytra are reduced to various degrees, (e.g., the beetle families Staphylinidae and Ripiphoridae), or secondarily lost altogether, as in various Elateroidea lineages with wingless females.

In some flightless groups, the elytra are present but fused together, and the hindwings are absent (e.g., some ground beetles (Carabidae), scarab beetles, and weevils).

References

  1. ^ a b "elytron". Merriam-Webster.com Dictionary. Merriam-Webster.
  2. ^ Michelle Gleeson (2016), Miniature Lives: Identifying Insects in Your Home and Garden, CSIRO Publishing, p. 313, ISBN 9781486301386
  3. ^ Augustus Radcliffe Grote (1909), Canadian Entomologist, vol. 41, Entomological Society of Canada
  4. ^ ἔλυτρον. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
  5. ^ Tihelka, Erik et al. “Mimicry in Cretaceous Bugs.” iScience vol. 23,7 (2020): 101280. doi:10.1016/j.isci.2020.101280
  6. ^ "Definition of SHARD". www.merriam-webster.com. Retrieved 2022-03-26.
  7. ^ Šípek, Petr; Fabrizi, Silvia; Eberle, Jonas; Ahrens, Dirk (2016). "A molecular phylogeny of rose chafers (Coleoptera: Scarabaeidae: Cetoniinae) reveals a complex and concerted morphological evolution related to their flight mode". Molecular Phylogenetics and Evolution. 101: 163–175. doi:10.1016/j.ympev.2016.05.012. PMID 27165937.
  8. ^ Cyre, Clayton (2024-05-12). "Minecraft Fan Builds Incredible Elytra Racecourse". Game Rant. Retrieved 2024-12-13.

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