tracheal mite

Definition

A parasitic mite that lives and reproduces within the tracheae (airways) of insects, typically causing respiratory impairment and physiological stress. These mites are microscopic, generally measuring less than 175 micrometres, and are obligate internal parasites with direct life cycles confined to the host's respiratory system. In honey bees, infestation produces acarine disease (acarapisosis), characterized by weakened flight ability, reduced lifespan, and colony decline; symptoms were first documented on the Isle of Wight in 1904. Diagnosis requires microscopic examination of dissected tracheae, as external inspection cannot detect these endoparasites.

Etymology

From Latin trachea (windpipe, from Greek tracheia artēria rough artery) + mite (Old English mīte small creature)

Example

Acarapis woodi, the honey bee tracheal mite, completes its entire life cycle within the thoracic tracheae of Apis mellifera, with female mites entering through the spiracles and laying eggs that develop through larval and nymphal stages before emerging as adults that mate within the host airway.

Synonyms

• tracheal parasite
• acarine (in specific contexts)

Related Terms

• Acarapis woodi
• acarine disease
• acarapisosis
• Spiracle
• Trachea
• Varroa mite
• honey bee pathology
• Endoparasite
• acarology

Usage Notes

The term is most commonly applied to Acarapis woodi in apiculture, but technically describes any mite species adapted to tracheal parasitism. Distinguished from external mites (e.g., Varroa destructor) by habitat and life history; tracheal mites require dissection for detection, whereas external parasites are visible on the host surface. The condition they cause is properly termed acarine disease or acarapisosis, not 'tracheal mite disease'.