Elytrum refers to the hardened forewings of certain insect species that serve to protect the delicate wings beneath. There are a number of synonyms for elytrum, depending on the species of insect being discussed. For example, carapace is a synonym for elytra in certain beetles, while wing covers or wing cases may be used for others. Other synonyms for elytra include tegmina and hemelytra, both of which are specific to certain types of insects. While these terms may vary slightly depending on the insect being discussed, they all refer to the protective, hardened coverings that serve to shield the wings of certain species from damage and danger.