Linked from
The 21 pages that link to Elytron, each with the reason it gives.
Insect wingBroader topic: Beetles retain flight-capable hindwings beneath protective forewings.
Arthropod exoskeletonBroader topic: Elytra turn part of the exoskeleton into a protective shield.
ColeopteraBroader topic: These defining forewings distinguish beetles from other insect orders.
BeetleBroader topic: Elytra are the defining structural feature of beetles.
Rove beetleBroader topic: Rove beetles’ unusually short elytra leave most of the abdomen uncovered.