An elytron (/ˈɛlɪtrɒn/; from Greek ἔλυτρον "sheath, cover"; plural: elytra /-trə/) is a modified, hardened forewing of certain insect orders, notably beetles (Coleoptera) and a few of the true bugs (Hemiptera) 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. An elytron is sometimes also referred to as a shard.