Elytron

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elytron

[′el·ə‚trän]
(invertebrate zoology)
One of the two sclerotized or leathery anterior wings of beetles which serve to cover and protect the membranous hindwings.
A dorsal scale of certain Polychaeta.

Elytron

 

one of the anterior wings that in most insects cover the posterior wings when the latter are folded along the dorsal wall of the body. Beetles have thickened elytra with practically no evidence of venation. The elytra of the Dictyoptera and Orthoptera are leathery and have noticeable or pronounced venation. Some insects, such as earwigs, have veinless elytra. In bedbugs, only the base of each elytron is thickened; the tip is membranous.

Elytra that are particularly thick no longer function as active organs of flight, becoming merely carrying surfaces (as in the June beetle), or play no role in flight at all (for example, the Cetonia). Many beetles in desert regions have greatly reduced posterior wings, and their elytra, as a rule, have fused to form a solid cover over the abdomen. The cavity under the elytra is exposed to the external atmosphere by a small opening at the top of the abdomen. Spiracles open into the cavity; the air in the cavity is heavily saturated with water vapor to minimize water loss during respiration. In many water beetles, for example the Dytiscidae, the cavity stores air, which the beetle can breathe as it swims through the water.

M. S. GILIAROV

References in periodicals archive ?
During bursts of brisk rocking movements male genitalia made rapid, shallow thrusts, the mouthparts rubbed vigorously on the female's elytra, and the antennae usually tapped on the sides of female pronotum.
Elytra overlap in the dorsal midline, and extend into the third abdominal tergite.
Elytra dorsally glabrous or with extremely fine microsetae and longer pubescence restricted to lateral portions.
Due to the fact that no direct observations were made under the passalid's elytra to avoid disturbing them, and initially the logs didn't have these organisms, we believe that pseudoscorpions were under the elytra of adult passalids from the moment they were collected.
Elytra slightly longer than wide, with dorsal posthumeral hump-like protuberance.
Prey manipulation associated with feeding was a frequent behavior and consisted of individuals facing upward or downward, culling wings, elytra, and legs of large prey items.
A head, thorax, abdomen, two cerci, two mandibles, two elytra, two wings, two of the same antennas, or six legs corresponded to one individual (Tergou et al., 2014), Davies (1977) proved that there is a strong correlation between prey remains in the faeces and the composition of the true diet in other insectivorous passerines.
from the Bingol Province in Turkey, the first species of the genus with costate elytra (Insecta: Coleoptera: Dytiscidae: Deronectina).
The "yellow beetle" is considered small, measuring 5 to 6 mm long, it is bright yellowish-brown, its ventral region is orange, elytra with 15 to 18 longitudinal carinae and with small circular dots in relation to the end of the wing.