Which mouthpart is characteristic of Lepidoptera and aids nectar feeding?

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The key idea here is how Lepidoptera access nectar. Adult butterflies and moths use a specialized mouthpart that is a long, slender proboscis formed by the paired maxillary galeae. This structure is designed for sucking liquids, and it can be tightly coiled under the head when not in use. When feeding, the proboscis uncoils to reach nectar in flowers with tubular shapes and uses muscular action to draw nectar up, effectively functioning as a siphon. This coiled feeding adapter is a hallmark of Lepidoptera’s nectar-feeding strategy. The other descriptions don’t fit this group: hardened forewings protect the wings in beetles; large mandibles for chewing wood point to other insects; and a blood-feeding siphon is associated with mosquitoes and similar flies, not Lepidoptera.