Hemiptera

Definition

An order of insects comprising the true bugs, characterized by piercing-sucking mouthparts formed into a segmented rostrum (beak) that arises from the anterior head and is typically folded ventrally at rest. The group includes more than 80,000 described species in suborders Auchenorrhyncha (cicadas, leafhoppers, planthoppers), Sternorrhyncha (aphids, scale insects, whiteflies), Heteroptera (shield bugs, assassin bugs, bed bugs), and Coleorrhyncha (moss bugs). The forewings of many species are hemelytra: basally leathery and apically membranous. Hemipterans occupy diverse ecological roles as phytophages, predators, and hematophages, with many species significant in agriculture, medicine, and disease ecology.

Etymology

From Neo-Latin, from Greek hēmi- (half) + pteron (wing), referring to the hemelytra of many true bugs.

Example

The brown marmorated stink bug (Halyomorpha halys), a heteropteran in Hemiptera, has become a major agricultural pest in North America and Europe, damaging fruit crops with its piercing-sucking mouthparts.

Synonyms

• true bugs

Related Terms

• Heteroptera
• Auchenorrhyncha
• Sternorrhyncha
• Coleorrhyncha
• hemelytron
• rostrum
• Homoptera
• Pentatomidae
• Cicadellidae
• Aphididae
• Reduviidae

Usage Notes

In strict entomological usage, 'bug' alone refers specifically to Hemiptera, not to insects in general. The former suborder Homoptera (aphids, cicadas, scale insects) is now treated as paraphyletic and has been reorganized into Sternorrhyncha and Auchenorrhyncha within Hemiptera. Some authors restrict 'true bugs' to Heteroptera only. The mouthpart structure (rostrum with stylets) is the definitive diagnostic feature, not wing texture alone—some hemipterans have fully membranous wings, and some non-hemipterans have hemelytra-like forewings.