Aphelocheiridae

Definition

A family of true bugs (Hemiptera) comprising the single genus Aphelocheirus, known as the creeping water bugs. These aquatic insects inhabit submerged substrates in running waters, where they respire through a plastron—a dense layer of hydrofuge hairs that traps a film of air, allowing gas exchange underwater without returning to the surface.

Etymology

Example

Aphelocheirus aestivalis, the most widespread species in the family Aphelocheiridae, uses its ventral plastron to remain submerged indefinitely in oxygenated streams.

Related Terms

• Aphelocheirus
• Plastron
• Nepomorpha
• aquatic respiration
• Hemiptera

Usage Notes

Monogeneric family; the genus Aphelocheirus contains all described species. Distinguished from other nepomorphan families by the combination of plastron respiration and creeping rather than swimming locomotion. Formerly placed in Naucoridae but elevated to family rank based on morphological and molecular evidence.