How are beetle elytra different from the forewings of true bugs?

Beetles (order Coleoptera) and true bugs (suborder Heteroptera) possess distinct wing structures that serve different primary functions:

• Beetle Elytra: The forewings of a beetle are called elytra. These are typically thickened, leathery, or hard and brittle structures that serve primarily as protective covers for the delicate hindwings and the abdomen. When at rest, they meet in a straight line down the back, completely covering the folded hindwings.12
• True Bug Forewings: The forewings of true bugs are often referred to as hemelytra. Unlike the uniform texture of beetle elytra, these wings are divided into two distinct sections: a thickened, leathery basal half and a thin, membranous apical half. When at rest, these wings are held flat over the abdomen, with the membranous tips overlapping one another.34

While both structures provide protection for the insect's body, the beetle's elytra function almost exclusively as a hardened shield, whereas the true bug's hemelytra retain a significant membranous component.134