Water bugs

Definition

Aquatic true bugs (Hemiptera) belonging to the infraorder Nepomorpha, encompassing families adapted to freshwater or marginal marine habitats with raptorial or piercing-sucking mouthparts and various respiratory adaptations including air stores (plastron respiration) or cutaneous respiration. The term most commonly designates the giant water bugs (Belostomatidae), creeping water bugs (Naucoridae), and velvet water bugs (Hebridae), though usage extends to other nepomorphan families.

Etymology

From Middle English water + bugge (insect), referring to aquatic habit.

Example

Lethocerus americanus, the giant water bug, is a voracious predator of small fish and tadpoles that uses its raptorial forelegs to seize prey and inject digestive enzymes through its piercing rostrum.

Synonyms

• aquatic bugs
• true water bugs

Related Terms

• Nepomorpha
• Belostomatidae
• Naucoridae
• Hebridae
• plastron respiration
• raptorial forelegs
• Hemiptera
• aquatic insects

Usage Notes

In entomological usage, 'water bugs' is informal and taxonomically imprecise—specialists prefer the formal infraorder name Nepomorpha or specific family names. The term excludes aquatic Heteroptera in Gerromorpha (water striders, water measurers) which inhabit the water surface rather than submerging. In pest control and public health contexts, 'water bug' is sometimes erroneously applied to the Oriental cockroach (Blatta orientalis), a misusage that should be avoided in biological contexts. The respiratory adaptations vary: Belostomatidae carry air bubbles beneath the wings, while Aphelocheiridae rely entirely on cutaneous plastron respiration.