Practice question

Coleoptera meaning sheath-wing forms largest insect order beetles and weevils with about 400,000 described species. Defining feature is forewings hardened into elytra, convex shields meeting in straight mid-dorsal suture protecting hind membranous wings folded transversely beneath when at rest, plus protecting dorsal abdomen against desiccation, abrasion and predation. Hind wings provide flight; elytra lift during takeoff. Chewing mouthparts common. Diptera flies possess one pair wings, Lepidoptera butterflies have scaled wings, Hymenoptera bees have membranous wings linked by hamuli. Elytral evolution correlates with colonization of soil, wood and aquatic habitats enabling beetle dominance.