Elytron - Wikipedia
https://en.wikipedia.org/wiki/Elytron
An elytron (/ ˈ ɛ l ɪ t r ɒ n /; from Greek ἔλυτρον "sheath, cover"; plural: elytra /-t r ə /) is a modified, hardened forewing of certain insect orders, notably beetles (Coleoptera) and a few of the true bugs such as the family Schizopteridae; in most true bugs, the forewings are instead called hemelytra (sometimes alternatively spelled as "hemielytra"), as only the basal half is thickened while the apex is membranous.
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