Hemipterans are a group of insects known as true bugs, characterized by mouthparts adapted for piercing and sucking.

• A. Coleoptera
• B. Diptera
• C. Hemipterans
• D. Lepidoptera

Answer: (C)

Piercing and sucking mouthparts point to Hemipterans. In true bugs, these mouthparts are transformed into a slender beak-like rostrum made from the mandibles and maxillae, forming a tube that punctures plant or animal tissue to suck fluids. This feeding adaptation is a defining feature of this group, linking the structure directly to their way of feeding. Other major insect orders have different primary mouthpart designs—beetles chew with mandibles, butterflies and moths have a long coiled proboscis for siphoning nectar, and flies show a variety of mouthparts, with piercing-sucking present in some but not characterizing the whole order. So the described mouthparts best identify this group.